diff --git a/src/app/features/settings/account/Profile.tsx b/src/app/features/settings/account/Profile.tsx
index 0fa983ce9..ce8728e5d 100644
--- a/src/app/features/settings/account/Profile.tsx
+++ b/src/app/features/settings/account/Profile.tsx
@@ -67,6 +67,7 @@ import {
   makePresetId,
   normalizeLabel,
 } from '../../../utils/statusPresets';
+import { writeStatusExpiry } from '../../../utils/statusExpiry';
 
 type ProfileProps = {
   profile: UserProfile;
@@ -508,12 +509,16 @@ function ProfileStatus() {
       if (msg && delayMs > 0) {
         // Persist the expiry timestamp; the always-mounted StatusExpiryMonitor
         // (ClientNonUIFeatures) fires the auto-clear even when Settings is closed.
-        localStorage.setItem(STATUS_EXPIRY_KEY(userId), String(Date.now() + delayMs));
+        const expiresAt = Date.now() + delayMs;
+        localStorage.setItem(STATUS_EXPIRY_KEY(userId), String(expiresAt));
+        // [Gitea #300] …and on every other Lotus device, via account data.
+        writeStatusExpiry(mx, msg, expiresAt).catch(() => undefined);
       } else {
         localStorage.removeItem(STATUS_EXPIRY_KEY(userId));
+        writeStatusExpiry(mx, msg).catch(() => undefined);
       }
     },
-    [saveStatus, userId],
+    [saveStatus, userId, mx],
   );
 
   const handleSubmit: FormEventHandler<HTMLFormElement> = (evt) => {
@@ -553,6 +558,7 @@ function ProfileStatus() {
     setStatusMsg('');
     localStorage.removeItem(STATUS_MSG_KEY(userId));
     localStorage.removeItem(STATUS_EXPIRY_KEY(userId));
+    writeStatusExpiry(mx, '').catch(() => undefined);
     // Preserve the user's chosen presence when clearing the status message.
     mx.setPresence({
       presence: presenceStateFromSetting(presenceStatus, hidePresence),
diff --git a/src/app/pages/client/ClientNonUIFeatures.tsx b/src/app/pages/client/ClientNonUIFeatures.tsx
index eab713f32..2c1c659c1 100644
--- a/src/app/pages/client/ClientNonUIFeatures.tsx
+++ b/src/app/pages/client/ClientNonUIFeatures.tsx
@@ -92,6 +92,7 @@ import {
   shouldNotifyThreadReply,
   THREAD_NOTIFICATIONS_FALLBACK_BEHAVIOR,
 } from '../../utils/threadNotifications';
+import { readStatusExpiry, statusExpiryAction, writeStatusExpiry } from '../../utils/statusExpiry';
 import { AccountDataEvent } from '../../../types/matrix/accountData';
 
 // Grace period after the initial sync settles before invite notifications arm, so
@@ -436,12 +437,7 @@ function StatusExpiryMonitor() {
     // permanently and the status stayed set forever. Retry the write (honouring
     // Retry-After), and only forget the status once the server has taken it.
     let clearing = false;
-    const check = () => {
-      if (clearing) return;
-      const stored = localStorage.getItem(expiryKey);
-      if (!stored) return;
-      const ts = parseInt(stored, 10);
-      if (!ts || Date.now() < ts) return;
+    const clearStatus = () => {
       clearing = true;
       setPresenceWithRetry(mx, {
         presence: presenceStateFromSetting(presenceStatusRef.current, hidePresenceRef.current),
@@ -451,12 +447,31 @@ function StatusExpiryMonitor() {
           noteLocalStatusWrite();
           localStorage.removeItem(msgKey);
           localStorage.removeItem(expiryKey);
+          writeStatusExpiry(mx, '').catch(() => undefined);
         })
         .catch(() => undefined)
         .finally(() => {
           clearing = false;
         });
     };
+    const check = () => {
+      if (clearing) return;
+      const stored = localStorage.getItem(expiryKey);
+      const ts = stored ? parseInt(stored, 10) : 0;
+      if (ts && Date.now() >= ts) {
+        clearStatus();
+        return;
+      }
+      // [Gitea #300] An expiry set on another device (account data): clear the
+      // status if it is still that one, otherwise just forget the expiry.
+      const action = statusExpiryAction(
+        readStatusExpiry(mx),
+        mx.getUser(userId)?.presenceStatusMsg,
+        Date.now(),
+      );
+      if (action === 'clear') clearStatus();
+      else if (action === 'forget') writeStatusExpiry(mx, '').catch(() => undefined);
+    };
 
     check();
     // Poll often enough that a rate-limited retry lands promptly, but not so
diff --git a/src/app/utils/statusExpiry.test.ts b/src/app/utils/statusExpiry.test.ts
new file mode 100644
index 000000000..0f5af329b
--- /dev/null
+++ b/src/app/utils/statusExpiry.test.ts
@@ -0,0 +1,22 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { parseStatusExpiry, statusExpiryAction } from './statusExpiry';
+
+test('parseStatusExpiry (#300)', () => {
+  assert.deepEqual(parseStatusExpiry({ status_msg: '🍔 Lunch', expires_at: 5 }), {
+    statusMsg: '🍔 Lunch',
+    expiresAt: 5,
+  });
+  assert.equal(parseStatusExpiry({}), undefined);
+  assert.equal(parseStatusExpiry({ status_msg: '', expires_at: 5 }), undefined);
+  assert.equal(parseStatusExpiry({ status_msg: 'x', expires_at: '5' }), undefined);
+});
+
+test('statusExpiryAction: clears only the status that was set to expire (#300)', () => {
+  const e = { statusMsg: '🍔 Lunch', expiresAt: 1000 };
+  assert.equal(statusExpiryAction(e, '🍔 Lunch', 999), 'none');
+  assert.equal(statusExpiryAction(e, '🍔 Lunch', 1000), 'clear');
+  assert.equal(statusExpiryAction(e, '🎮 Gaming', 2000), 'forget');
+  assert.equal(statusExpiryAction(e, '', 2000), 'forget');
+  assert.equal(statusExpiryAction(undefined, 'x', 2000), 'none');
+});
diff --git a/src/app/utils/statusExpiry.ts b/src/app/utils/statusExpiry.ts
new file mode 100644
index 000000000..73ad15ed0
--- /dev/null
+++ b/src/app/utils/statusExpiry.ts
@@ -0,0 +1,46 @@
+import { MatrixClient } from 'matrix-js-sdk';
+import { AccountDataEvent } from '../../types/matrix/accountData';
+import { getAccountData } from './room';
+
+/**
+ * [Gitea #300] The status message's auto-clear time, in account data so every
+ * Lotus device knows it. Before, only the device that set "clear after 1 hour"
+ * (localStorage) ever cleared it, and only while it was open.
+ */
+export type StatusExpiry = { statusMsg: string; expiresAt: number };
+
+/** Pure: parse `io.lotus.status_expiry` content. */
+export function parseStatusExpiry(content: unknown): StatusExpiry | undefined {
+  const c = content as { status_msg?: unknown; expires_at?: unknown } | undefined;
+  if (!c || typeof c.status_msg !== 'string' || typeof c.expires_at !== 'number') return undefined;
+  if (!c.status_msg || !Number.isFinite(c.expires_at)) return undefined;
+  return { statusMsg: c.status_msg, expiresAt: c.expires_at };
+}
+
+/**
+ * Pure: what to do with a due expiry. Clear the server status only if it is
+ * still the one that was set to expire; if it has since changed (e.g. on
+ * another device), just forget the expiry.
+ */
+export function statusExpiryAction(
+  entry: StatusExpiry | undefined,
+  currentStatusMsg: string | undefined,
+  now: number,
+): 'none' | 'clear' | 'forget' {
+  if (!entry || now < entry.expiresAt) return 'none';
+  return (currentStatusMsg ?? '') === entry.statusMsg ? 'clear' : 'forget';
+}
+
+export const readStatusExpiry = (mx: MatrixClient): StatusExpiry | undefined =>
+  parseStatusExpiry(getAccountData(mx, AccountDataEvent.LotusStatusExpiry)?.getContent());
+
+/** Record (or with no `expiresAt`, remove) the shared auto-clear time. */
+export async function writeStatusExpiry(
+  mx: MatrixClient,
+  statusMsg: string,
+  expiresAt?: number,
+): Promise<void> {
+  const content =
+    statusMsg && expiresAt !== undefined ? { status_msg: statusMsg, expires_at: expiresAt } : {};
+  await mx.setAccountData(AccountDataEvent.LotusStatusExpiry as never, content as never);
+}
diff --git a/src/types/matrix/accountData.ts b/src/types/matrix/accountData.ts
index 74e8dee4a..72f1d0854 100644
--- a/src/types/matrix/accountData.ts
+++ b/src/types/matrix/accountData.ts
@@ -26,6 +26,9 @@ export enum AccountDataEvent {
   // [Gitea #104] Synced subset of the Lotus Settings object (utils/settingsSync).
   LotusSettings = 'io.lotus.settings',
 
+  // [Gitea #300] When the status message auto-clears: { status_msg, expires_at },
+  // so any Lotus device can clear it (not only the one that set it).
+  LotusStatusExpiry = 'io.lotus.status_expiry',
   // [Gitea #333] Timed mutes: { timers: { [roomId]: unmuteAt } }, so any Lotus
   // device can lift a mute set on another.
   LotusMuteTimers = 'io.lotus.mute_timers',