diff --git a/app/(dashboard)/quizzes/labels.ts b/app/(dashboard)/quizzes/labels.ts
index 4749b58..f82db6a 100644
--- a/app/(dashboard)/quizzes/labels.ts
+++ b/app/(dashboard)/quizzes/labels.ts
@@ -7,11 +7,23 @@ export const KIND_LABEL: Record<Quiz["target_kind"], string> = {
   standalone: "Stand-alone",
 };
 
-/** "1m 12s" / "8.4s" — response times read better than raw milliseconds. */
+/**
+ * "8.4s" / "1m 12s" / "3h 20m" / "2d 4h" — response times read better than
+ * raw milliseconds. Hours past 23h 59m roll up into days. Mirrors fmtMs in
+ * the app's quiz-result-view.tsx.
+ */
 export function fmtMs(ms: number | null | undefined): string {
   if (ms == null) return "—";
-  if (ms < 60_000) return `${(ms / 1000).toFixed(1)}s`;
-  const m = Math.floor(ms / 60_000);
-  const s = Math.round((ms % 60_000) / 1000);
+  // Below 59.95s: one decimal place (anything higher would print "60.0s").
+  if (ms < 59_950) return `${(ms / 1000).toFixed(1)}s`;
+  // Whole seconds from here, so rounding can't print "1m 60s".
+  const total = Math.round(ms / 1000);
+  const d = Math.floor(total / 86_400);
+  const h = Math.floor((total % 86_400) / 3600);
+  const m = Math.floor((total % 3600) / 60);
+  const s = total % 60;
+  // The two largest units: 2d 4h · 3h 20m · 12m 5s.
+  if (d > 0) return `${d}d ${h}h`;
+  if (h > 0) return `${h}h ${m}m`;
   return `${m}m ${s}s`;
 }