feat(eta): Use new ETA calculation method

static/js/dom-manipulation.js

@@ -14,7 +14,7 @@ const durationTimer = () => {
 
     const updateDuration = (task) => {
       if (task?.status == 'completed') {
-        duration = task.completed_at - task.created_at;
+        duration = Date.now() / 1_000 - task.created_at;
         return;
       }