diff --git a/frontend/src/lib/components/JobStatus.svelte b/frontend/src/lib/components/JobStatus.svelte
index 7945081482..020fd4ab39 100644
--- a/frontend/src/lib/components/JobStatus.svelte
+++ b/frontend/src/lib/components/JobStatus.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { displayDate, msToReadableTime } from '$lib/utils'
+	import { displayDate, jobDisplayDurationMs, msToReadableTime } from '$lib/utils'
 	import type { CompletedJob, QueuedJob } from '$lib/gen'
 	import Badge from './common/badge/Badge.svelte'
 	import { forLater } from '$lib/forLater'
@@ -20,7 +20,7 @@
 
 {#if job && 'success' in job && job.success}
 	<Badge {large} color="green">
-		Successfully ran in {msToReadableTime(job.duration_ms)}
+		Successfully ran in {msToReadableTime(jobDisplayDurationMs(job))}
 		{job.is_skipped ? '(Skipped)' : ''}
 		{#if job.self_wait_time_ms || job.aggregate_wait_time_ms}
 			<WaitTimeWarning
@@ -34,7 +34,7 @@
 	<Badge {large} color="orange" title={job.resolution_note}>
 		<!-- `resolved_by` is absent both for an automatic resolution and for a manual one
 		     outside EE, so the automatic wording comes from `resolved_automatically`. -->
-		Failed after {msToReadableTime(job.duration_ms)}, resolved{job.resolved_automatically
+		Failed after {msToReadableTime(jobDisplayDurationMs(job))}, resolved{job.resolved_automatically
 			? ' automatically'
 			: job.resolved_by
 				? ` by ${job.resolved_by}`
@@ -49,7 +49,7 @@
 	</Badge>
 {:else if job && 'success' in job}
 	<Badge {large} color="red">
-		Failed after {msToReadableTime(job.duration_ms)}
+		Failed after {msToReadableTime(jobDisplayDurationMs(job))}
 		{#if job.self_wait_time_ms || job.aggregate_wait_time_ms}
 			<WaitTimeWarning
 				self_wait_time_ms={job.self_wait_time_ms}
diff --git a/frontend/src/lib/components/jobs/JobPreview.svelte b/frontend/src/lib/components/jobs/JobPreview.svelte
index 972cff6799..675c9d1ef5 100644
--- a/frontend/src/lib/components/jobs/JobPreview.svelte
+++ b/frontend/src/lib/components/jobs/JobPreview.svelte
@@ -15,6 +15,7 @@
 	import { Badge } from '../common'
 	import { forLater } from '$lib/forLater'
 	import DurationMs from '../DurationMs.svelte'
+	import { jobDisplayDurationMs } from '$lib/utils'
 	import { workspaceStore } from '$lib/stores'
 	import { twMerge } from 'tailwind-merge'
 
@@ -29,6 +30,7 @@
 	let { id, children, class: clazz }: Props = $props()
 
 	let job: Job | undefined = $state(undefined)
+	let displayDurationMs = $derived(jobDisplayDurationMs(job))
 	let hovered = $state(false)
 	let timeout: number | undefined
 	let result: any = $state()
@@ -155,9 +157,9 @@
 				<Badge>
 					Mem: {job?.['mem_peak'] ? `${(job['mem_peak'] / 1024).toPrecision(4)}MB` : 'N/A'}
 				</Badge>
-				{#if job?.['duration_ms']}
+				{#if displayDurationMs}
 					<DurationMs
-						duration_ms={job?.['duration_ms']}
+						duration_ms={displayDurationMs}
 						self_wait_time_ms={job?.self_wait_time_ms}
 						aggregate_wait_time_ms={job?.aggregate_wait_time_ms}
 					/>
diff --git a/frontend/src/lib/components/runs/JobDetailFieldConfig.ts b/frontend/src/lib/components/runs/JobDetailFieldConfig.ts
index b324fe335e..c0148cfc24 100644
--- a/frontend/src/lib/components/runs/JobDetailFieldConfig.ts
+++ b/frontend/src/lib/components/runs/JobDetailFieldConfig.ts
@@ -1,6 +1,6 @@
 import type { Job } from '$lib/gen'
 import { triggerIconMap } from '$lib/components/triggers/utils'
-import { formatMemory } from '$lib/utils'
+import { formatMemory, jobDisplayDurationMs } from '$lib/utils'
 import { flowPathToHref } from '$lib/scripts'
 import { Calendar, Bot } from 'lucide-svelte'
 import BarsStaggered from '$lib/components/icons/BarsStaggered.svelte'
@@ -332,8 +332,8 @@ export const fieldConfigs: Record<JobField, FieldConfig> = {
 		field: 'duration',
 		label: 'Duration',
 		getValue: (job) => {
-			if ('duration_ms' in job && job.duration_ms) {
-				const ms = job.duration_ms
+			const ms = jobDisplayDurationMs(job)
+			if (ms) {
 				if (ms < 1000) return `${ms}ms`
 				if (ms < 60000) return `${(ms / 1000).toFixed(1)}s`
 				return `${(ms / 60000).toFixed(1)}m`
diff --git a/frontend/src/lib/utils.test.ts b/frontend/src/lib/utils.test.ts
index b0d18473f1..f75c66edd8 100644
--- a/frontend/src/lib/utils.test.ts
+++ b/frontend/src/lib/utils.test.ts
@@ -10,7 +10,8 @@ import {
 	getQueryStmtCountHeuristic,
 	isJobResolvable,
 	parseDbInputFromAssetSyntax,
-	apiErrorMessage
+	apiErrorMessage,
+	jobDisplayDurationMs
 } from './utils'
 
 // Mirrors the backend invariant that only `status = 'failure'` rows can carry a
@@ -598,3 +599,51 @@ describe('apiErrorMessage', () => {
 		expect(apiErrorMessage(new Error('boom'))).toBe('boom')
 	})
 })
+
+// AI-agent jobs populate `workflow_as_code_status` too, so keying off the column
+// alone would swap their duration for wall-clock and count queue-free idle time.
+describe('jobDisplayDurationMs', () => {
+	const wac = { workflow_as_code_status: { _checkpoint: { completed_steps: {} } } }
+
+	it('reports wall-clock for a workflow-as-code job', () => {
+		expect(
+			jobDisplayDurationMs({
+				...wac,
+				started_at: '2026-08-03T15:21:04.863Z',
+				completed_at: '2026-08-03T15:21:19.612Z',
+				duration_ms: 2058
+			})
+		).toBe(14749)
+	})
+
+	it('keeps duration_ms for an AI-agent job and a plain script', () => {
+		expect(
+			jobDisplayDurationMs({
+				workflow_as_code_status: { 'step-1': { name: 'tool' } },
+				started_at: '2026-08-03T15:21:04.863Z',
+				completed_at: '2026-08-03T15:21:19.612Z',
+				duration_ms: 2058
+			})
+		).toBe(2058)
+		expect(
+			jobDisplayDurationMs({
+				started_at: '2026-08-03T15:21:00.809Z',
+				completed_at: '2026-08-03T15:21:04.858Z',
+				duration_ms: 4046
+			})
+		).toBe(4046)
+	})
+
+	it('falls back to duration_ms when the timestamps are missing or inverted', () => {
+		expect(jobDisplayDurationMs({ ...wac, started_at: '2026-08-03T15:21:04.863Z', duration_ms: 7 }))
+			.toBe(7)
+		expect(
+			jobDisplayDurationMs({
+				...wac,
+				started_at: '2026-08-03T15:21:19.612Z',
+				completed_at: '2026-08-03T15:21:04.863Z',
+				duration_ms: 7
+			})
+		).toBe(7)
+	})
+})
diff --git a/frontend/src/lib/utils.ts b/frontend/src/lib/utils.ts
index 2e538a635f..d3490fe70a 100644
--- a/frontend/src/lib/utils.ts
+++ b/frontend/src/lib/utils.ts
@@ -253,6 +253,47 @@ export function msToReadableTime(ms: number | undefined, maximumFractionDigits?:
 	}
 }
 
+/**
+ * A job ran through the workflow-as-code (WAC) executor iff its
+ * `workflow_as_code_status` carries a `_checkpoint`. AI-agent jobs populate the
+ * same column but never write `_checkpoint`, so they must not match here.
+ */
+export function isWorkflowAsCodeJob(
+	job: { workflow_as_code_status?: unknown } | undefined
+): boolean {
+	const wac = job?.workflow_as_code_status as Record<string, unknown> | undefined
+	return wac != undefined && wac['_checkpoint'] != undefined
+}
+
+/**
+ * Total execution time to display for a job, in ms.
+ *
+ * A WAC job suspends while the task jobs it dispatches run, so its `duration_ms`
+ * covers only the orchestration script's own compute, not the end-to-end run. For
+ * those, show the wall-clock span (`completed_at - started_at`) — the same total a
+ * flow reports. `duration_ms` must keep counting compute only: cloud usage
+ * accounting and workspace fairness consume it as service time.
+ */
+export function jobDisplayDurationMs(
+	job:
+		| {
+				started_at?: string
+				completed_at?: string
+				duration_ms?: number
+				workflow_as_code_status?: unknown
+		  }
+		| undefined
+): number | undefined {
+	if (isWorkflowAsCodeJob(job) && job?.started_at && job?.completed_at) {
+		const start = new Date(job.started_at).getTime()
+		const end = new Date(job.completed_at).getTime()
+		if (isFinite(start) && isFinite(end) && end >= start) {
+			return end - start
+		}
+	}
+	return job?.duration_ms
+}
+
 export function msToReadableTimeShort(
 	ms: number | undefined,
 	maximumFractionDigits?: number