diff --git a/src/workspaces/officerdev/src/apps/Chat/background-job-prompt.ts b/src/workspaces/officerdev/src/apps/Chat/background-job-prompt.ts
index 59182667..e511f058 100644
--- a/src/workspaces/officerdev/src/apps/Chat/background-job-prompt.ts
+++ b/src/workspaces/officerdev/src/apps/Chat/background-job-prompt.ts
@@ -18,17 +18,22 @@ export type BackgroundJobSpec = {
   condition: string;
   /** Whether firing ends the job. Ignored without a condition. */
   stopOnFire: boolean;
-  /** `session` = until this chat ends. A number = minutes. `until-stopped` = until told otherwise. */
-  duration: 'session' | 'until-stopped' | number;
+  /**
+   * Minutes to run for, or `null` to run until stopped.
+   *
+   * There used to be a "this session" option. It meant nothing: the backend deliberately holds the agent
+   * process alive while a job is running, so closing the browser does not end one — "this session" and
+   * "until stopped" were the same thing wearing two labels.
+   */
+  duration: number | null;
   /** Where it runs. The panel's own directory, so nothing has to be typed. */
   cwd: string;
 };
 
-const durationLine = (d: BackgroundJobSpec['duration']): string => {
-  if (d === 'session') return 'Run until this session ends. Do not bound the loop by time.';
-  if (d === 'until-stopped') return 'Run until I stop it. Do not bound the loop by time.';
-  return `Run for about ${d} minute${d === 1 ? '' : 's'}, then exit 1 to say it timed out.`;
-};
+const durationLine = (d: BackgroundJobSpec['duration']): string =>
+  d === null
+    ? 'Run until I stop it. Do not bound the loop by time.'
+    : `Run for about ${d} minute${d === 1 ? '' : 's'}, then exit 1 to say it timed out.`;
 
 export function buildBackgroundJobPrompt(spec: BackgroundJobSpec): string {
   const watching = spec.condition.trim().length > 0;
diff --git a/src/workspaces/officerdev/src/apps/Chat/components/BackgroundJobDialog.tsx b/src/workspaces/officerdev/src/apps/Chat/components/BackgroundJobDialog.tsx
index ff8a948b..cb4a79b9 100644
--- a/src/workspaces/officerdev/src/apps/Chat/components/BackgroundJobDialog.tsx
+++ b/src/workspaces/officerdev/src/apps/Chat/components/BackgroundJobDialog.tsx
@@ -34,15 +34,15 @@ type BackgroundJobDialogProps = {
   onSubmit: (intent: string, preamble: string) => void;
 };
 
-type Duration = 'session' | 'until-stopped' | 'timed';
-
 export const BackgroundJobDialog = ({ open, onOpenChange, cwd, onSubmit }: BackgroundJobDialogProps) => {
   const [mode, setMode] = useState<'command' | 'prompt'>('command');
   const [body, setBody] = useState('');
   const [watching, setWatching] = useState(false);
   const [condition, setCondition] = useState('');
   const [stopOnFire, setStopOnFire] = useState(true);
-  const [duration, setDuration] = useState<Duration>('session');
+  // Unchecked means no time bound — the job runs until stopped. There is no third option: the backend
+  // keeps the agent alive while a job runs, so "this session" would have meant the same thing.
+  const [timed, setTimed] = useState(false);
   const [minutes, setMinutes] = useState(60);
 
   useEffect(() => {
@@ -52,7 +52,7 @@ export const BackgroundJobDialog = ({ open, onOpenChange, cwd, onSubmit }: Backg
     setWatching(false);
     setCondition('');
     setStopOnFire(true);
-    setDuration('session');
+    setTimed(false);
     setMinutes(60);
   }, [open]);
 
@@ -74,7 +74,7 @@ export const BackgroundJobDialog = ({ open, onOpenChange, cwd, onSubmit }: Backg
       body,
       condition: watching ? condition : '',
       stopOnFire,
-      duration: duration === 'timed' ? minutes : duration,
+      duration: timed ? minutes : null,
       cwd,
     };
     // The intent is what the transcript shows; the preamble rides underneath it.
@@ -151,36 +151,21 @@ export const BackgroundJobDialog = ({ open, onOpenChange, cwd, onSubmit }: Backg
           </div>
 
           <div className="space-y-1">
-            <Label className="text-xs uppercase tracking-wide text-duck-dark/40">Duration</Label>
             <label className="flex items-center gap-2 text-sm">
-              <input type="radio" checked={duration === 'session'} onChange={() => setDuration('session')} />
-              This session
-            </label>
-            <label className="flex items-center gap-2 text-sm">
-              <input type="radio" checked={duration === 'timed'} onChange={() => setDuration('timed')} />
-              For
+              <input type="checkbox" checked={timed} onChange={(ev) => setTimed(ev.target.checked)} />
+              Stop after
               <input
                 type="number"
                 min={1}
                 value={minutes}
-                onFocus={() => setDuration('timed')}
+                disabled={!timed}
                 onChange={(ev) => setMinutes(Math.max(1, Number(ev.target.value) || 1))}
-                className="w-16 rounded border border-duck-dark/20 bg-transparent px-1.5 py-0.5 text-sm"
+                className="w-16 rounded border border-duck-dark/20 bg-transparent px-1.5 py-0.5 text-sm disabled:opacity-40"
               />
               minutes
             </label>
-            <label className="flex items-center gap-2 text-sm">
-              <input
-                type="radio"
-                checked={duration === 'until-stopped'}
-                onChange={() => setDuration('until-stopped')}
-              />
-              Until stopped
-            </label>
-            {/* Said plainly rather than promised. The job is a descendant of this session's process, so
-                nothing here outlives the session — including "until stopped". */}
             <p className="pt-1 text-xs text-duck-dark/40">
-              All of these end if the session does — the job runs underneath it.
+              {timed ? 'Exits when the time is up, whether or not it fired.' : 'Runs until you stop it.'}
             </p>
           </div>
         </div>