diff --git a/frontend/public/components/utils/__tests__/build-utils.spec.ts b/frontend/public/components/utils/__tests__/build-utils.spec.ts
new file mode 100644
index 00000000000..2fd49fc350b
--- /dev/null
+++ b/frontend/public/components/utils/__tests__/build-utils.spec.ts
@@ -0,0 +1,33 @@
+import { displayDurationInWords } from '../build-utils';
+
+jest.mock('i18next', () => ({
+  t: (key: string) => key.replace('public~', ''),
+}));
+
+describe('displayDurationInWords', () => {
+  it('returns - when start is missing', () => {
+    expect(displayDurationInWords('', '2024-01-01T00:00:00Z')).toEqual('-');
+  });
+
+  it('formats sub-hour durations', () => {
+    expect(
+      displayDurationInWords('2024-01-01T00:00:00Z', '2024-01-01T00:01:05Z'),
+    ).toEqual('1 minute 5 seconds');
+  });
+
+  it('formats multi-hour durations', () => {
+    expect(
+      displayDurationInWords('2024-01-01T00:00:00Z', '2024-01-01T01:02:03Z'),
+    ).toEqual('1 hour 2 minutes 3 seconds');
+  });
+
+  it('formats durations longer than 60 hours', () => {
+    expect(
+      displayDurationInWords('2024-01-01T00:00:00Z', '2024-01-05T04:00:00Z'),
+    ).toEqual('100 hours');
+  });
+
+  it('returns - for invalid timestamps', () => {
+    expect(displayDurationInWords('invalid', '2024-01-01T00:00:00Z')).toEqual('-');
+  });
+});
diff --git a/frontend/public/components/utils/build-utils.ts b/frontend/public/components/utils/build-utils.ts
index f675a142596..6d4b5055a3b 100644
--- a/frontend/public/components/utils/build-utils.ts
+++ b/frontend/public/components/utils/build-utils.ts
@@ -6,30 +6,30 @@ export const displayDurationInWords = (start: string, stop: string): string => {
   }
   const startTime = new Date(start).getTime();
   const stopTime = stop ? new Date(stop).getTime() : new Date().getTime();
-  let duration = Math.round((stopTime - startTime) / 1000);
-  const time = [];
-  let durationInWords = '';
-  while (duration >= 60) {
-    time.push(duration % 60);
-    duration = Math.floor(duration / 60);
+  const duration = Math.max(0, Math.round((stopTime - startTime) / 1000));
+  if (!Number.isFinite(duration)) {
+    return '-';
   }
-  time.push(duration);
-  if (time[2]) {
-    durationInWords += `${time[2]} ${
-      time[2] > 1 ? i18next.t('public~hours') : i18next.t('public~hour')
-    } `;
+  const seconds = duration % 60;
+  const minutes = Math.floor(duration / 60) % 60;
+  const hours = Math.floor(duration / 3600);
+  const durationInWords = [];
+  if (hours) {
+    durationInWords.push(
+      `${hours} ${hours > 1 ? i18next.t('public~hours') : i18next.t('public~hour')}`,
+    );
   }
-  if (time[1]) {
-    durationInWords += `${time[1]} ${
-      time[1] > 1 ? i18next.t('public~minutes') : i18next.t('public~minute')
-    } `;
+  if (minutes) {
+    durationInWords.push(
+      `${minutes} ${minutes > 1 ? i18next.t('public~minutes') : i18next.t('public~minute')}`,
+    );
   }
-  if (time[0]) {
-    durationInWords += `${time[0]} ${
-      time[0] > 1 ? i18next.t('public~seconds') : i18next.t('public~second')
-    } `;
+  if (seconds || !durationInWords.length) {
+    durationInWords.push(
+      `${seconds} ${seconds === 1 ? i18next.t('public~second') : i18next.t('public~seconds')}`,
+    );
   }
-  return durationInWords.trim();
+  return durationInWords.join(' ');
 };
 
 export enum BuildStrategyType {