diff --git a/src/mocks/jobs.json b/src/mocks/jobs.json
deleted file mode 100644
index ec61624..0000000
--- a/src/mocks/jobs.json
+++ /dev/null
@@ -1,5 +0,0 @@
-[
-  { "title": "Monitor Real-Time Stock Market Data", "runningTime": "2m 34s", "progress": 65, "startTime": "2026-06-30T20:48:00Z", "eta": "2026-06-30T20:52:00Z" },
-  { "title": "Image Generation", "runningTime": "5m 12s", "progress": 30, "startTime": "2026-06-30T20:36:00Z", "eta": "2026-06-30T21:00:00Z" },
-  { "title": "Process & Categorize Inbox Emails", "runningTime": "12m 47s", "progress": 88, "startTime": "2026-06-30T20:25:00Z", "eta": "2026-06-30T20:40:00Z" }
-]
diff --git a/src/mocks/jobs.ts b/src/mocks/jobs.ts
new file mode 100644
index 0000000..7a467c8
--- /dev/null
+++ b/src/mocks/jobs.ts
@@ -0,0 +1,22 @@
+const now = new Date()
+
+export default [
+  {
+    title: 'Monitor Real-Time Stock Market Data',
+    progress: 65,
+    startTime: new Date(now.getTime() - 100000).toISOString(),
+    eta: new Date(now.getTime() + 100000).toISOString(),
+  },
+  {
+    title: 'Image Generation',
+    progress: 30,
+    startTime: new Date(now.getTime() - 55000).toISOString(),
+    eta: new Date(now.getTime() + 300000).toISOString(),
+  },
+  {
+    title: 'Process & Categorize Inbox Emails',
+    progress: 88,
+    startTime: new Date(now.getTime() - 30000).toISOString(),
+    eta: new Date(now.getTime() + 30000).toISOString(),
+  },
+]
diff --git a/src/utils/datetime.ts b/src/utils/datetime.ts
index 23a31c6..f8ab4b0 100644
--- a/src/utils/datetime.ts
+++ b/src/utils/datetime.ts
@@ -1,7 +1,23 @@
 export function formatTime(iso: string, options?: Intl.DateTimeFormatOptions): string {
   return new Date(iso).toLocaleTimeString([], {
-    hour: "2-digit",
-    minute: "2-digit",
+    hour: '2-digit',
+    minute: '2-digit',
     ...options,
   })
 }
+
+export function formatElapsed(startTime: string): string {
+  const elapsed = Math.max(0, Math.floor((Date.now() - new Date(startTime).getTime()) / 1000))
+  const days = Math.floor(elapsed / 86400)
+  const hours = Math.floor((elapsed % 86400) / 3600)
+  const minutes = Math.floor((elapsed % 3600) / 60)
+  const seconds = elapsed % 60
+
+  const parts: string[] = []
+  if (days > 0) parts.push(`${days}d`)
+  if (hours > 0) parts.push(`${hours}h`)
+  if (minutes > 0) parts.push(`${minutes}m`)
+  parts.push(`${seconds}s`)
+
+  return parts.join(' ')
+}