diff --git a/CHANGELOG.md b/CHANGELOG.md
index bbbe6b2..3c5769a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ All notable changes to this project will be documented in this file.
 
 ### Fixed
 
-- Animation delays now work in slide and template previews and player playback. Outro timing follows each preset's computed Animate.css duration, is configured as time before transition, and preview-only region staggering is removed; slide animation controls enforce the same advanced limits as templates.
+- Animation delays now work in slide and template previews and player playback. Outro timing follows each preset's computed Animate.css duration and is configured as time before transition; preview cleanup waits for each preset's computed runtime, preview-only region staggering is removed, and slide animation controls enforce the same advanced limits as templates.
 
 ## 2.21.1 - 2026-10-26
 
diff --git a/src/web/public/js/slides/slide-animation-editor.js b/src/web/public/js/slides/slide-animation-editor.js
index f1dba06..27cb9fe 100644
--- a/src/web/public/js/slides/slide-animation-editor.js
+++ b/src/web/public/js/slides/slide-animation-editor.js
@@ -132,6 +132,17 @@ export function createSlideAnimationEditor(options) {
   function getPreviewElements() {
     return Array.prototype.slice.call(previewHost.querySelectorAll('.slide-preview-region[data-region-key]'));
   }
+  function getAnimationDurationMs(element, fallbackDurationMs) {
+    if (typeof window.getComputedStyle !== 'function') return fallbackDurationMs;
+    var durations = String(window.getComputedStyle(element).animationDuration || '').split(',');
+    var longestDuration = durations.reduce(function (longest, value) {
+      var match = value.trim().match(/^([\d.]+)\s*(ms|s)$/i);
+      if (!match) return longest;
+      var duration = Number(match[1]) * (match[2].toLowerCase() === 's' ? 1000 : 1);
+      return Number.isFinite(duration) ? Math.max(longest, duration) : longest;
+    }, 0);
+    return longestDuration || fallbackDurationMs;
+  }
   function stopPreview() {
     if (previewTimer) window.clearTimeout(previewTimer);
     previewTimer = 0;
@@ -185,7 +196,7 @@ export function createSlideAnimationEditor(options) {
       void element.offsetWidth;
       element.classList.add('animate__animated', 'animate__' + preset);
       if (mode === 'loop') element.classList.add('animate__repeat-1');
-      longest = Math.max(longest, delay + duration * iterations);
+      longest = Math.max(longest, delay + getAnimationDurationMs(element, duration) * iterations);
     });
     updatePreviewButtons();
     previewTimer = window.setTimeout(function () {
diff --git a/test/region-layout.test.js b/test/region-layout.test.js
index 7f0a157..faf0292 100644
--- a/test/region-layout.test.js
+++ b/test/region-layout.test.js
@@ -383,7 +383,13 @@ test('slide advanced popup applies changes, cancels drafts and preserves the par
   };
   const modalInstances = new Map();
   const scrollBarCalls = [];
-  const context = { window: { innerWidth: 1200, setTimeout() { return 1; }, clearTimeout() {}, pulseModal: {
+  const previewTimers = [];
+  const context = { window: { innerWidth: 1200,
+    setTimeout(_callback, delay) { previewTimers.push(delay); return previewTimers.length; }, clearTimeout() {},
+    getComputedStyle() {
+      return { animationDuration: '400ms' };
+    },
+    pulseModal: {
     show(modal) { this.getOrCreate(modal)._scrollBar.hide(); modal.shown = true; },
     hide(modal) { this.getOrCreate(modal)._scrollBar.reset(); modal.shown = false; modal.handlers['hidden.bs.modal'](); },
     getOrCreate(modal) {
@@ -410,7 +416,7 @@ test('slide advanced popup applies changes, cancels drafts and preserves the par
     getTemplate() { return { regions: [
       { region_key: 'hero', animation_json: { intro: { preset: 'bounceIn' }, outro: { preset: 'fadeOut' } } },
       { region_key: 'fixed_brand', read_only: true, animation_json: {
-        outro: { preset: 'fadeOut', duration_ms: 200, delay_ms: 500 },
+        outro: { preset: 'hinge', duration_ms: 200, delay_ms: 500 },
         loop: { preset: 'pulse', duration_ms: 200, delay_ms: 240, iterations: 1 }
       } },
       { region_key: 'fixed_brand_second', read_only: true, animation_json: { loop: { preset: 'pulse', duration_ms: 200, iterations: 1 } } }
@@ -432,6 +438,7 @@ test('slide advanced popup applies changes, cancels drafts and preserves the par
   animationPreviewButtons[1].handlers.click();
   assert.equal(readonlyPreviewRegion.style.values['animation-delay'], '0ms');
   animationPreviewButtons[1].handlers.click();
+  assert.equal(previewTimers[previewTimers.length - 1], 580);
   const resetRegion = ids['slide-animation-reset-region'];
   const resetAll = ids['slide-animation-reset-all'];
   assert.equal(resetRegion.disabled, true);