diff --git a/.github/workflows/viewerjs-check.yml b/.github/workflows/viewerjs-check.yml
index 485c223..41ddf1b 100644
--- a/.github/workflows/viewerjs-check.yml
+++ b/.github/workflows/viewerjs-check.yml
@@ -26,7 +26,12 @@ jobs:
     container:
       image: mcr.microsoft.com/playwright:v1.64.1-noble
       options: --user 1001
-    timeout-minutes: 25
+    # This job runs every page workflow twice (chromium, then touch) on one worker with V8 coverage on, so it
+    # takes about twice a single-browser job. Measured 2026-10-20: whole job 18m26s-24m57s (main 5ded3cf
+    # 22m15s; PR head 6359999 was cancelled at the old 25-minute limit while still passing), coverage step
+    # alone 20m55s-22m17s+, against ~12-15 minutes for the firefox/webkit jobs. 40 minutes leaves headroom
+    # for suite growth while still stopping a hung run; re-measure if a run passes 30 minutes.
+    timeout-minutes: 40
     steps:
       - uses: actions/checkout@v7
       # The image's own Python 3.12 and Node 24: setup-python/setup-node install the runner's toolcache
diff --git a/tests/browser/images-concept.spec.mjs b/tests/browser/images-concept.spec.mjs
index 0777b0c..e88d417 100644
--- a/tests/browser/images-concept.spec.mjs
+++ b/tests/browser/images-concept.spec.mjs
@@ -410,7 +410,12 @@ for(const [width,height] of SIZES)for(const theme of THEMES)test(`images page ge
         await openProductionLoaded(page,theme,motion,total);
         const before=await page.locator(CARDS).count();
         const loadingRow=(await inventoryOf(page,'#workspace-main')).continuation,loadingCount=await countText(page);
-        await page.getByRole('button',{name:'Load more images',exact:true}).click();
+        // A dispatched press, as on the concept side: a pointer click scrolls the row into view first, and the page's
+        // own observer (rootMargin 250px) can append the final batch and hide the button before the click lands
+        // (WebKit, run 39512528039). The button must still be the enabled one the user would press.
+        const more=page.getByRole('button',{name:'Load more images',exact:true});
+        await expect(more).toBeVisible();await expect(more).toHaveAttribute('aria-disabled','false');
+        await more.dispatchEvent('click');
         await expect(page.locator('#result-count')).toHaveText(new RegExp(`^${total} of ${total} images`));
         result[motion].productionLoad={before,after:await page.locator(CARDS).count(),toast:await toastText(page),count:await countText(page)};
         result[motion].loadingDiff=compareLoadingRow(result[motion].conceptLoad.loadingRow,loadingRow,loadingCount);