diff --git a/components/calendar/__tests__/event-popover-duration-ux-p2-pim.test.tsx b/components/calendar/__tests__/event-popover-duration-ux-p2-pim.test.tsx
new file mode 100644
index 000000000..8968975ef
--- /dev/null
+++ b/components/calendar/__tests__/event-popover-duration-ux-p2-pim.test.tsx
@@ -0,0 +1,55 @@
+import { render, screen } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { useSettingsStore } from '@/stores/settings-store';
+import { AUTO_TIME_ZONE } from '@/lib/timezone';
+import type { Calendar, CalendarEvent } from '@/lib/jmap/types';
+
+// pim-p2-19: the German popover read "16:00 – 17:00 (1h)"; German writes "1 Std.".
+
+const lang = vi.hoisted(() => ({ locale: 'de' }));
+vi.mock('next-intl', () => ({
+  useTranslations: () => (key: string, values?: Record<string, unknown>) => (values ? `${key}:${JSON.stringify(values)}` : key),
+  useLocale: () => lang.locale,
+  useFormatter: () => ({ dateTime: (d: Date | string) => String(d), relativeTime: (d: Date | string) => String(d), number: (n: number) => String(n) }),
+}));
+
+import { EventDetailPopover } from '../event-detail-popover';
+
+const calendar = { id: 'cal', name: 'Work', myRights: { mayWriteAll: true, mayWriteOwn: true } } as unknown as Calendar;
+
+function popover(duration: string) {
+  const event = {
+    id: 'e1', calendarIds: { cal: true }, title: 'Team sync', start: '2026-11-05T16:00:00', duration,
+    timeZone: 'Europe/Berlin', showWithoutTime: false, participants: null, alerts: null, useDefaultAlerts: false,
+  } as unknown as CalendarEvent;
+  render(
+    <EventDetailPopover event={event} calendar={calendar} anchorRect={new DOMRect(100, 100, 50, 20)}
+      onEdit={vi.fn()} onDelete={vi.fn()} onDuplicate={vi.fn()} onClose={vi.fn()} onSaveNote={vi.fn()}
+      currentUserEmails={['me@example.com']} />,
+  );
+}
+
+beforeEach(() => useSettingsStore.setState({ timeZone: 'Europe/Berlin' }));
+afterEach(() => {
+  useSettingsStore.setState({ timeZone: AUTO_TIME_ZONE });
+  lang.locale = 'de';
+});
+
+describe('the popover writes the duration in the app language', () => {
+  it('in German', () => {
+    popover('PT1H');
+    expect(screen.getByText('(1 Std.)')).toBeInTheDocument();
+    expect(screen.queryByText('(1h)')).toBeNull();
+  });
+
+  it('with hours and minutes', () => {
+    popover('PT1H30M');
+    expect(screen.getByText('(1 Std. 30 Min.)')).toBeInTheDocument();
+  });
+
+  it('in English', () => {
+    lang.locale = 'en';
+    popover('PT45M');
+    expect(screen.getByText('(45 min)')).toBeInTheDocument();
+  });
+});
diff --git a/components/calendar/event-detail-popover.tsx b/components/calendar/event-detail-popover.tsx
index a9c6529b0..b6cff7a0b 100644
--- a/components/calendar/event-detail-popover.tsx
+++ b/components/calendar/event-detail-popover.tsx
@@ -114,12 +114,20 @@ function computePosition(
   };
 }
 
-function formatDurationDisplay(minutes: number): string {
-  if (minutes < 60) return `${minutes}min`;
+/** "1 hr 30 min", "1 Std. 30 Min.": the language's own short units (pim-p2-19). */
+export function formatDurationDisplay(minutes: number, locale: string): string {
+  const unit = (value: number, name: "hour" | "minute") => {
+    try {
+      return new Intl.NumberFormat(locale, { style: "unit", unit: name, unitDisplay: "short" }).format(value);
+    } catch {
+      return `${value}${name === "hour" ? "h" : "min"}`;
+    }
+  };
   const h = Math.floor(minutes / 60);
   const m = minutes % 60;
-  if (m === 0) return `${h}h`;
-  return `${h}h${m}min`;
+  if (h === 0) return unit(m, "minute");
+  if (m === 0) return unit(h, "hour");
+  return `${unit(h, "hour")} ${unit(m, "minute")}`;
 }
 
 function getRecurrenceLabel(event: CalendarEvent, t: ReturnType<typeof useTranslations>, locale: string): string | null {
@@ -506,7 +514,7 @@ export function EventDetailPopover({
                     </span>
                   </div>
                   <div className="text-muted-foreground text-xs">
-                    ({formatDurationDisplay(durationMinutes)})
+                    ({formatDurationDisplay(durationMinutes, locale)})
                   </div>
                   {zoned && zonedText && (
                     <div className="text-muted-foreground text-xs" data-testid="event-zone-times">
@@ -529,7 +537,7 @@ export function EventDetailPopover({
                 ) : (
                   <div className="text-muted-foreground">
                     <bdi dir="ltr">{formatTime(startDate)} – {formatTime(endDate)}</bdi>
-                    <span className="ms-1.5 text-xs">({formatDurationDisplay(durationMinutes)})</span>
+                    <span className="ms-1.5 text-xs">({formatDurationDisplay(durationMinutes, locale)})</span>
                   </div>
                 )}
               </>