diff --git a/frontend/src/pages/TestsPage.tsx b/frontend/src/pages/TestsPage.tsx
index 805bfbd..3b6390e 100644
--- a/frontend/src/pages/TestsPage.tsx
+++ b/frontend/src/pages/TestsPage.tsx
@@ -231,13 +231,14 @@ export default function TestsPage() {
           const aIsBlue = a.state === "blue_evaluating";
           const bIsBlue = b.state === "blue_evaluating";
           if (aIsBlue && bIsBlue) {
-            av = a.updated_at || "";
-            bv = b.updated_at || "";
+            // Older blue_started_at = waited longer = sort first in asc
+            av = (a as any).blue_started_at || a.created_at || "";
+            bv = (b as any).blue_started_at || b.created_at || "";
           } else {
             if (aIsBlue && !bIsBlue) return sortDir === "asc" ? -1 : 1;
             if (!aIsBlue && bIsBlue) return sortDir === "asc" ? 1 : -1;
-            av = a.updated_at || "";
-            bv = b.updated_at || "";
+            av = (a as any).blue_started_at || a.created_at || "";
+            bv = (b as any).blue_started_at || b.created_at || "";
           }
           break;
         }
@@ -579,11 +580,11 @@ export default function TestsPage() {
                   <td className="py-3 px-4 text-gray-400 text-xs">
                     {test.platform || "-"}
                   </td>
-                  {/* Waiting time — meaningful for blue_evaluating */}
+                  {/* Waiting time — how long since Red submitted to Blue */}
                   <td className="py-3 px-4 text-xs whitespace-nowrap">
                     {test.state === "blue_evaluating" ? (
                       <span className="font-mono text-indigo-400">
-                        {formatElapsed(test.updated_at)}
+                        {formatElapsed(test.blue_started_at)}
                       </span>
                     ) : (
                       <span className="text-gray-700">—</span>