diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a6b00b..a1f5dfa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## v0.9.2 — 2026-09-17 18:10
+- **Power-of-two time scale** (left-pane UI refinement + API range bump): the slider now steps through the discrete ladder **1× → 2× → 4× → 8× → 16× → 32× → 64×** — each of the 7 positions doubles the speed instead of the v0.9.1 continuous log mapping `round(60^t)`. `lib/timeScale.ts` rewritten: `TIME_SCALES = [1,2,4,8,16,32,64]`, `sliderToScale(t)` maps to the nearest ladder step (exact at endpoints 0→1×, 1→64×), `scaleToSlider(s)` places a scale on its nearest position by log₂ distance; off-ladder values (e.g. a legacy 60) snap to the nearest power of two
+- **Server clamp raised [1,60] → [1,64]** so the top of the ladder actually works end-to-end: `MAX_TIME_SCALE = 64` in `lib/sim/engine.ts`, error message + comments in `app/api/sim/route.ts`, OpenAPI `SimState.timeScale`/`SimControlsRequest.timeScale` maximums updated (spec lives in code per AGENTS.md)
+- Slider step is now `1/6` (7 positions, one doubling per keyboard-arrow step); debounce/release-flush/in-flight-queue commit behavior from v0.9.1 unchanged; "N×" label and pause toggle unchanged
+- Tests: unit — `lib/timeScale.test.ts` rewritten for the ladder (endpoint exactness 0→1/1→64, all 7 positions map to [1,2,4,8,16,32,64], monotonic non-decreasing over a 2000-step grid, only-ladder-values output, clamping of out-of-range/non-finite input, round-trip for every ladder value, off-ladder snapping 3→4 and legacy 60→64); `app/api/sim/route.test.ts` clamp matrix updated (500 → 64, new 64 pass-through case, both-fields call at 64); `lib/openapi.test.ts` maximum assertion 60 → 64; e2e — `panes.spec.ts` slider test now drives End → "64×" + `/api/state` timeScale=64 and Home → "1×"+timeScale=1, `sim.spec.ts` clamp-high expectation 60 → 64 (scale-60 tick-math test unchanged — 60 still passes through unclamped); live instance restored to scale 1 + unpaused in-test and in `afterEach` as before
+- Verified: unit suite green; `tsc --noEmit` clean; e2e re-run against the rebuilt compose instance
+
 ## v0.9.1 — 2026-09-17 16:03
 - **Log-scale time slider** (left-pane UI refinement): the 1x–60x `<select>` in `components/LeftPane.tsx` is replaced by a single `<input type="range" data-testid="time-scale-slider">` — position t ∈ [0,1] maps to `scale = round(60^t)` (t=0→1×, mid≈8×, t=1→60×) so equal slider distances are equal multiplicative steps; 60 discrete positions (`step = 1/59`) keep keyboard arrows usable (~7% per step). The current value is shown beside the slider as "N×" (`data-testid="time-scale-value"`); pause/resume toggle unchanged
 - **Debounced commit**: dragging updates the displayed value optimistically; `POST /api/sim {timeScale}` fires after a 250 ms debounce and flushes immediately on release (native `change` event); a commit landing while another POST is in flight is held in a single slot and flushed right after, so rapid slider moves never drop the last intent — server's [1,60] clamp kept as backstop, no new dependencies
diff --git a/app/api/sim/route.test.ts b/app/api/sim/route.test.ts
index a245a53..5eaf66a 100644
--- a/app/api/sim/route.test.ts
+++ b/app/api/sim/route.test.ts
@@ -31,15 +31,20 @@ describe('POST /api/sim', () => {
     expect(body.paused).toBe(false);
   });
 
-  it('sets and clamps timeScale into [1, 60]', async () => {
+  it('sets and clamps timeScale into [1, 64]', async () => {
     const hi = await post({ timeScale: 500 });
     expect(hi.status).toBe(200);
-    expect(((await hi.json()) as { timeScale: number }).timeScale).toBe(60);
+    expect(((await hi.json()) as { timeScale: number }).timeScale).toBe(64);
 
     const lo = await post({ timeScale: 0.1 });
     expect(lo.status).toBe(200);
     expect(((await lo.json()) as { timeScale: number }).timeScale).toBe(1);
 
+    // The top of the power-of-two ladder passes through unclamped (v0.9.2).
+    const max = await post({ timeScale: 64 });
+    expect(max.status).toBe(200);
+    expect(((await max.json()) as { timeScale: number }).timeScale).toBe(64);
+
     const mid = await post({ timeScale: 37 });
     expect(mid.status).toBe(200);
     expect(((await mid.json()) as { timeScale: number }).timeScale).toBe(37);
@@ -66,10 +71,10 @@ describe('POST /api/sim', () => {
   });
 
   it('applies both fields in one call', async () => {
-    const res = await post({ timeScale: 60, paused: true });
+    const res = await post({ timeScale: 64, paused: true });
     expect(res.status).toBe(200);
     const body = (await res.json()) as { timeScale: number; paused: boolean };
-    expect(body.timeScale).toBe(60);
+    expect(body.timeScale).toBe(64);
     expect(body.paused).toBe(true);
     await post({ timeScale: 1, paused: false }); // restore
   });
diff --git a/app/api/sim/route.ts b/app/api/sim/route.ts
index 2466ee1..22e3722 100644
--- a/app/api/sim/route.ts
+++ b/app/api/sim/route.ts
@@ -1,6 +1,6 @@
 import { applyTimeControls } from '@/lib/sim/engine';
 
-// POST /api/sim — set sim time controls (v0.7.0). Body: { timeScale?: 1–60, paused?: boolean }.
+// POST /api/sim — set sim time controls (v0.7.0). Body: { timeScale?: 1–64, paused?: boolean }.
 // Ticks the clock first (so the response reflects current game time), then applies
 // and persists the new controls. Returns the updated simState.
 
@@ -23,7 +23,7 @@ export async function POST(req: Request) {
     }
   }
   if (input.timeScale !== undefined && (typeof input.timeScale !== 'number' || !Number.isFinite(input.timeScale))) {
-    return Response.json({ error: 'timeScale must be a finite number (1–60)' }, { status: 400 });
+    return Response.json({ error: 'timeScale must be a finite number (1–64)' }, { status: 400 });
   }
   if (input.paused !== undefined && typeof input.paused !== 'boolean') {
     return Response.json({ error: 'paused must be a boolean' }, { status: 400 });
diff --git a/components/LeftPane.tsx b/components/LeftPane.tsx
index 5283760..e2b8db5 100644
--- a/components/LeftPane.tsx
+++ b/components/LeftPane.tsx
@@ -4,7 +4,7 @@ import { useCallback, useEffect, useRef, useState, type ChangeEvent } from 'reac
 import type { ContractState, PlaneState, StateSnapshot } from '@/lib/game/state';
 import { PLANE_TYPES } from '@/lib/game/catalog';
 import { formatCash, formatFuel, formatSimClock } from '@/lib/format';
-import { scaleToSlider, sliderToScale } from '@/lib/timeScale';
+import { TIME_SCALES, scaleToSlider, sliderToScale } from '@/lib/timeScale';
 
 interface LeftPaneProps {
   state: StateSnapshot | null;
@@ -14,9 +14,9 @@ interface LeftPaneProps {
   onRefresh: () => void;
 }
 
-// Log-scale slider (v0.9.1): position t ∈ [0,1] → scale = round(60^t), so equal distances
-// are equal multiplicative steps. 60 discrete positions keep keyboard arrows usable (~7% per step).
-const SCALE_SLIDER_STEP = 1 / 59;
+// Power-of-two slider (v0.9.2): position t ∈ [0,1] → nearest step of the ladder
+// 1×/2×/4×/8×/16×/32×/64× — each of the 7 positions doubles the speed.
+const SCALE_SLIDER_STEP = 1 / (TIME_SCALES.length - 1); // one doubling per keyboard-arrow step
 const SCALE_COMMIT_DEBOUNCE_MS = 250;
 
 function planeLocation(p: PlaneState, contracts: ContractState[]): string {
@@ -34,7 +34,7 @@ export default function LeftPane({ state, loading, error, onRefresh }: LeftPaneP
   // controls without waiting for the next poll tick. On failure keep the stale UI — the
   // running poll retries on its own and surfaces the error state. A commit that lands while
   // another POST is in flight is held in a single slot and flushed right after, so the last
-  // user intent always reaches the server (the server's [1,60] clamp stays as backstop).
+  // user intent always reaches the server (the server's [1,64] clamp stays as backstop).
   const queuedRef = useRef<{ timeScale?: number; paused?: boolean } | null>(null);
 
   const applySimControls = useCallback(
@@ -73,7 +73,7 @@ export default function LeftPane({ state, loading, error, onRefresh }: LeftPaneP
   // Slider commit (v0.9.1): the displayed value follows the drag optimistically via
   // pendingScale; POST /api/sim fires after a 250 ms debounce, or immediately when the
   // user releases the slider (browsers fire a native 'change' on release). The server's
-  // [1,60] clamp stays as the backstop.
+  // [1,64] clamp stays as the backstop.
   const [pendingScale, setPendingScaleState] = useState<number | null>(null);
   const pendingRef = useRef<number | null>(null);
   const commitTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
diff --git a/e2e/panes.spec.ts b/e2e/panes.spec.ts
index bf07942..367fb18 100644
--- a/e2e/panes.spec.ts
+++ b/e2e/panes.spec.ts
@@ -54,7 +54,7 @@ test('left pane renders wallet, reputation and the starter fleet at Frankfurt',
   await expect(page.getByTestId('sim-clock')).toContainText(/UTC/);
 });
 
-test('time controls: pause freezes the sim and the log-scale slider sets timeScale', async ({ page }) => {
+test('time controls: pause freezes the sim and the power-of-two slider sets timeScale', async ({ page }) => {
   await page.goto('/');
   const pauseBtn = page.getByTestId('pause-toggle');
   await expect(pauseBtn).toBeVisible({ timeout: 15_000 });
@@ -65,13 +65,13 @@ test('time controls: pause freezes the sim and the log-scale slider sets timeSca
   // …and in the pane itself (the refetch after POST flips the button to Resume).
   await expect(pauseBtn).toHaveText('Resume');
 
-  // Scale via the log-scale slider. End jumps to max (t=1 → 60×): the label updates
+  // Scale via the power-of-two slider. End jumps to max (t=1 → 64×): the label updates
   // optimistically on input, and release flushes the debounced POST immediately.
   const slider = page.getByTestId('time-scale-slider');
   await slider.focus();
   await page.keyboard.press('End');
-  await expect(page.getByTestId('time-scale-value')).toHaveText('60×', { timeout: 10_000 });
-  await expect.poll(async () => (await getState(page)).simState.timeScale, { timeout: 10_000 }).toBe(60);
+  await expect(page.getByTestId('time-scale-value')).toHaveText('64×', { timeout: 10_000 });
+  await expect.poll(async () => (await getState(page)).simState.timeScale, { timeout: 10_000 }).toBe(64);
 
   // Home jumps to min (t=0 → 1×).
   await page.keyboard.press('Home');
diff --git a/e2e/sim.spec.ts b/e2e/sim.spec.ts
index 32c22a7..4a742a9 100644
--- a/e2e/sim.spec.ts
+++ b/e2e/sim.spec.ts
@@ -134,7 +134,7 @@ test('the hook can also create a fresh short-deadline contract, which then expir
 test('POST /api/sim validates and clamps its input', async ({ page }) => {
   const clampHigh = await postSim(page, { timeScale: 500 });
   expect(clampHigh.status()).toBe(200);
-  expect(((await clampHigh.json()) as SimState).timeScale).toBe(60);
+  expect(((await clampHigh.json()) as SimState).timeScale).toBe(64); // top of the power-of-two ladder (v0.9.2)
 
   const clampLow = await postSim(page, { timeScale: 0.1 });
   expect(clampLow.status()).toBe(200);
diff --git a/lib/openapi.test.ts b/lib/openapi.test.ts
index bfaec65..a44b124 100644
--- a/lib/openapi.test.ts
+++ b/lib/openapi.test.ts
@@ -122,7 +122,7 @@ describe('OpenAPI spec', () => {
     expect(Object.keys(controls).sort()).toEqual(['paused', 'timeScale']);
     expect(controls.timeScale.type).toBe('number');
     expect(controls.timeScale.minimum).toBe(1);
-    expect(controls.timeScale.maximum).toBe(60);
+    expect(controls.timeScale.maximum).toBe(64);
     expect(controls.paused.type).toBe('boolean');
 
     const error = openApiSpec.components.schemas.Error.properties;
diff --git a/lib/openapi.ts b/lib/openapi.ts
index dcea408..3c4f8c2 100644
--- a/lib/openapi.ts
+++ b/lib/openapi.ts
@@ -336,7 +336,7 @@ export const openApiSpec = {
         type: 'object',
         properties: {
           clockMs: { type: 'integer', description: 'Sim-clock epoch ms (game time)' },
-          timeScale: { type: 'number', minimum: 1, maximum: 60 },
+          timeScale: { type: 'number', minimum: 1, maximum: 64 },
           paused: { type: 'boolean' },
         },
         required: ['clockMs', 'timeScale', 'paused'],
@@ -348,8 +348,8 @@ export const openApiSpec = {
           timeScale: {
             type: 'number',
             minimum: 1,
-            maximum: 60,
-            description: 'Game-time multiplier; values outside [1, 60] are clamped.',
+            maximum: 64,
+            description: 'Game-time multiplier; values outside [1, 64] are clamped. The UI offers the power-of-two ladder 1/2/4/8/16/32/64.',
           },
           paused: { type: 'boolean' },
         },
diff --git a/lib/sim/engine.ts b/lib/sim/engine.ts
index 6a47b22..49d20c8 100644
--- a/lib/sim/engine.ts
+++ b/lib/sim/engine.ts
@@ -22,12 +22,12 @@ import { arrivalTimeFor, fuelAt } from './movement';
 // Clamp constant: max real-time gap counted by a single tick. Chosen at 2000 ms —
 // comfortably above a normal client poll interval (~1 s), so active play advances
 // ~real time × scale; small enough that one stale read after an absence moves game
-// time by at most 2 s × scale (≤ 2 min even at max scale 60). The sim therefore
+// time by at most 2 s × scale (≈ 2 min even at max scale 64). The sim therefore
 // only meaningfully progresses while actively polled.
 export const MAX_TICK_ELAPSED_MS = 2_000;
 
 export const MIN_TIME_SCALE = 1;
-export const MAX_TIME_SCALE = 60;
+export const MAX_TIME_SCALE = 64; // top of the power-of-two ladder (v0.9.2)
 
 // Reputation gain per completed contract: BASE + PER_KM × great-circle km, rounded
 // to 2 decimals (reputation is REAL). A short hop (~300 km) earns ~1.15 rep, a
@@ -252,7 +252,7 @@ export function runAction<T>(fn: (inst: GameDb) => Promise<T>): Promise<T> {
 }
 
 // Tick first so the returned state reflects current time, then apply the new
-// controls. timeScale is clamped to [1, 60]; validation of raw input happens in
+// controls. timeScale is clamped to [1, 64]; validation of raw input happens in
 // the route handler (400 on non-number / non-boolean).
 export function applyTimeControls(input: SimControlsInput): Promise<schema.SimStateRow> {
   return withLock(async () => {
diff --git a/lib/timeScale.test.ts b/lib/timeScale.test.ts
index ef02f24..fa24474 100644
--- a/lib/timeScale.test.ts
+++ b/lib/timeScale.test.ts
@@ -1,30 +1,34 @@
 import { describe, expect, it } from 'vitest';
-import { MAX_SCALE, MIN_SCALE, scaleToSlider, sliderToScale } from './timeScale';
+import { MAX_SCALE, MIN_SCALE, TIME_SCALES, scaleToSlider, sliderToScale } from './timeScale';
+
+const STEPS = TIME_SCALES.length - 1; // 6 intervals across the 7 ladder positions
 
 describe('sliderToScale', () => {
-  it('is exact at the endpoints (0 → 1×, 1 → 60×)', () => {
+  it('is exact at the endpoints (0 → 1×, 1 → 64×)', () => {
     expect(sliderToScale(0)).toBe(MIN_SCALE);
     expect(sliderToScale(1)).toBe(MAX_SCALE);
   });
 
-  it('maps mid-slider to ~8× (√60 rounds to 8)', () => {
-    expect(sliderToScale(0.5)).toBe(8);
+  it('maps each of the 7 positions to the power-of-two ladder', () => {
+    const expected = [1, 2, 4, 8, 16, 32, 64];
+    for (let i = 0; i < TIME_SCALES.length; i++) {
+      expect(sliderToScale(i / STEPS)).toBe(expected[i]);
+    }
   });
 
   it('is monotonic non-decreasing across the whole range', () => {
     let prev = sliderToScale(0);
     for (let i = 1; i <= 2000; i++) {
-      const t = i / 2000;
-      const s = sliderToScale(t);
+      const s = sliderToScale(i / 2000);
       expect(s).toBeGreaterThanOrEqual(prev);
       prev = s;
     }
   });
 
-  it('covers every integer scale 1..60 somewhere on the slider', () => {
-    const seen = new Set<number>();
-    for (let i = 0; i <= 2000; i++) seen.add(sliderToScale(i / 2000));
-    for (let s = MIN_SCALE; s <= MAX_SCALE; s++) expect(seen.has(s)).toBe(true);
+  it('only ever returns a ladder value', () => {
+    for (let i = 0; i <= 2000; i++) {
+      expect(TIME_SCALES).toContain(sliderToScale(i / 2000));
+    }
   });
 
   it('clamps out-of-range and non-finite input', () => {
@@ -35,9 +39,15 @@ describe('sliderToScale', () => {
 });
 
 describe('scaleToSlider', () => {
-  it('is exact at the endpoints (1× → 0, 60× → 1)', () => {
+  it('is exact at the endpoints (1× → 0, 64× → 1)', () => {
     expect(scaleToSlider(1)).toBe(0);
-    expect(scaleToSlider(60)).toBe(1);
+    expect(scaleToSlider(64)).toBe(1);
+  });
+
+  it('places each ladder value on its own position', () => {
+    for (let i = 0; i < TIME_SCALES.length; i++) {
+      expect(scaleToSlider(TIME_SCALES[i])).toBeCloseTo(i / STEPS, 12);
+    }
   });
 
   it('stays within [0, 1] for in-range scales', () => {
@@ -51,15 +61,20 @@ describe('scaleToSlider', () => {
   it('clamps out-of-range and non-finite input', () => {
     expect(scaleToSlider(0)).toBe(0);
     expect(scaleToSlider(-3)).toBe(0);
-    expect(scaleToSlider(61)).toBe(1);
+    expect(scaleToSlider(65)).toBe(1);
     expect(scaleToSlider(NaN)).toBe(0);
   });
 });
 
 describe('round-trip', () => {
-  it('sliderToScale(scaleToSlider(s)) === s for every integer scale 1..60', () => {
-    for (let s = MIN_SCALE; s <= MAX_SCALE; s++) {
+  it('sliderToScale(scaleToSlider(s)) === s for every ladder value', () => {
+    for (const s of TIME_SCALES) {
       expect(sliderToScale(scaleToSlider(s))).toBe(s);
     }
   });
+
+  it('maps off-ladder scales to the nearest power of two', () => {
+    expect(sliderToScale(scaleToSlider(3))).toBe(4); // log2(3) ≈ 1.58 → step 2 (4×)
+    expect(sliderToScale(scaleToSlider(60))).toBe(64); // legacy max from the v0.9.x era
+  });
 });
diff --git a/lib/timeScale.ts b/lib/timeScale.ts
index a941933..92d5790 100644
--- a/lib/timeScale.ts
+++ b/lib/timeScale.ts
@@ -1,22 +1,24 @@
-// Pure log-scale mapping helpers for the time-scale slider (v0.9.1) — no game logic,
-// unit-testable in node. Slider position t ∈ [0,1] ↔ scale = round(60^t), so equal
-// distances on the slider correspond to equal multiplicative steps: 1× at t=0, ~8×
-// mid-slider, 60× at t=1 (matching POST /api/sim's clamp range).
+// Pure mapping helpers for the time-scale slider (v0.9.2) — no game logic, unit-testable
+// in node. The slider has 7 discrete positions on a power-of-two ladder:
+// 1× → 2× → 4× → 8× → 16× → 32× → 64×, so each step doubles the speed (matching
+// POST /api/sim's clamp range [1, 64]).
 
-export const MIN_SCALE = 1;
-export const MAX_SCALE = 60;
+export const TIME_SCALES = [1, 2, 4, 8, 16, 32, 64] as const;
+export const MIN_SCALE: number = TIME_SCALES[0];
+export const MAX_SCALE: number = TIME_SCALES[TIME_SCALES.length - 1];
 
 const clamp = (v: number, lo: number, hi: number) => Math.min(hi, Math.max(lo, v));
 
-// t → scale. Exact at the endpoints: sliderToScale(0) === 1, sliderToScale(1) === 60.
+// t → scale: the position maps to the nearest ladder step. Exact at the endpoints:
+// sliderToScale(0) === 1, sliderToScale(1) === 64.
 export function sliderToScale(t: number): number {
   const tt = clamp(Number.isFinite(t) ? t : 0, 0, 1);
-  return Math.round(clamp(Math.pow(MAX_SCALE, tt), MIN_SCALE, MAX_SCALE));
+  return TIME_SCALES[clamp(Math.round(tt * (TIME_SCALES.length - 1)), 0, TIME_SCALES.length - 1)];
 }
 
-// scale → t (inverse of the pre-rounding mapping). Exact at the endpoints:
-// scaleToSlider(1) === 0, scaleToSlider(60) === 1. Round-trips every integer 1..60.
+// scale → t: the nearest ladder position by log2 distance. Exact at the endpoints:
+// scaleToSlider(1) === 0, scaleToSlider(64) === 1; round-trips every value in TIME_SCALES.
 export function scaleToSlider(scale: number): number {
   const s = clamp(Number.isFinite(scale) ? scale : MIN_SCALE, MIN_SCALE, MAX_SCALE);
-  return Math.log(s) / Math.log(MAX_SCALE);
+  return Math.log2(s) / Math.log2(MAX_SCALE);
 }
diff --git a/package.json b/package.json
index 94964bf..dcba020 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "flight-ops",
-  "version": "0.9.1",
+  "version": "0.9.2",
   "private": true,
   "scripts": {
     "dev": "next dev -p 3000",