diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90a55a23..9e7a3a02 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- A long error in Admin now stays on screen long enough to read, up to fifteen
+  seconds.
+
 ## [1.6.0] - 2026-08-13
 
 ### Added
diff --git a/ui/js/admin-logic.js b/ui/js/admin-logic.js
index a0ca5b37..4662c86f 100644
--- a/ui/js/admin-logic.js
+++ b/ui/js/admin-logic.js
@@ -227,3 +227,10 @@ export function rejectionLines(rejections, { withName = true } = {}) {
 export function refusedNoticeKey(count) {
   return count === 1 ? 'widgetCfg.refused' : 'widgetCfg.refusedPlural';
 }
+
+/* Long errors need longer than short confirmations. 60ms per character is
+   about 16 characters a second, under a slow reading speed. */
+export function toastMs(message) {
+  const len = typeof message === 'string' ? message.length : 0;
+  return Math.min(15000, Math.max(3000, len * 60));
+}
diff --git a/ui/js/admin-shared.js b/ui/js/admin-shared.js
index d6676732..b8540ad0 100644
--- a/ui/js/admin-shared.js
+++ b/ui/js/admin-shared.js
@@ -1,5 +1,5 @@
 /* Stateless helpers shared by the admin modules. Mutable state stays out. */
-import { nextActiveIndex, recoversSession } from '/js/admin-logic.js?v=056a11e9';
+import { nextActiveIndex, recoversSession, toastMs } from '/js/admin-logic.js?v=056a11e9';
 import { el, qa, q } from '/js/utils.js?v=84d58686';
 import { t } from '/js/i18n.js?v=133a7aac';
 
@@ -11,7 +11,7 @@ export const toast = (m, t = 'ok') => {
   e.textContent = m;
   e.className = `show ${t}`;
   clearTimeout(tt);
-  tt = setTimeout(() => (e.className = ''), 3000);
+  tt = setTimeout(() => (e.className = ''), toastMs(m));
 };
 
 /* Carry `kind` and `detail`, so callers branch on data, never on message
diff --git a/ui/test/admin-logic.test.mjs b/ui/test/admin-logic.test.mjs
index e6b261f1..ac974b61 100644
--- a/ui/test/admin-logic.test.mjs
+++ b/ui/test/admin-logic.test.mjs
@@ -16,6 +16,7 @@ import {
   settingsSaveBlocker,
   clearsStoredPassword,
   recoversSession,
+  toastMs,
   BLOCK,
 } from '../js/admin-logic.js';
 /* The real strength check, so these assert the rule the save actually applies. */
@@ -485,3 +486,11 @@ test('recoversSession tolerates a missing path', () => {
   assert.equal(recoversSession(undefined, 401), true);
   assert.equal(recoversSession(null, 200), false);
 });
+
+test('toastMs holds a long message longer than a short one', () => {
+  assert.equal(toastMs('Saved'), 3000);
+  assert.equal(toastMs(''), 3000);
+  assert.equal(toastMs('x'.repeat(100)), 6000);
+  assert.equal(toastMs('x'.repeat(1000)), 15000);
+  assert.equal(toastMs(undefined), 3000);
+});