diff --git a/resources/js/admin/i18n/locales/de/management.json b/resources/js/admin/i18n/locales/de/management.json
index 6a6f4ca..aaa3d8e 100644
--- a/resources/js/admin/i18n/locales/de/management.json
+++ b/resources/js/admin/i18n/locales/de/management.json
@@ -2883,6 +2883,7 @@
     "kpiLikes": "Likes",
     "activityTitle": "Aktivitäts-Zeitachse",
     "timeframe": "Letzte {{hours}} Stunden",
+    "timeframeHint": "Ältere Aktivität ausgeblendet",
     "uploadsPerHour": "Uploads pro Stunde",
     "noActivity": "Noch keine Uploads",
     "emptyActionShareQr": "QR-Code teilen",
diff --git a/resources/js/admin/i18n/locales/en/management.json b/resources/js/admin/i18n/locales/en/management.json
index 9a59bbc..cb7932e 100644
--- a/resources/js/admin/i18n/locales/en/management.json
+++ b/resources/js/admin/i18n/locales/en/management.json
@@ -2887,6 +2887,7 @@
     "kpiLikes": "Likes",
     "activityTitle": "Activity Timeline",
     "timeframe": "Last {{hours}} hours",
+    "timeframeHint": "Older activity hidden",
     "uploadsPerHour": "Uploads per hour",
     "noActivity": "No uploads yet",
     "emptyActionShareQr": "Share your QR code",
diff --git a/resources/js/admin/mobile/EventAnalyticsPage.tsx b/resources/js/admin/mobile/EventAnalyticsPage.tsx
index 307321e..d753513 100644
--- a/resources/js/admin/mobile/EventAnalyticsPage.tsx
+++ b/resources/js/admin/mobile/EventAnalyticsPage.tsx
@@ -98,7 +98,10 @@ export default function MobileEventAnalyticsPage() {
   const hasTimeline = timeline.length > 0;
   const hasContributors = contributors.length > 0;
   const hasTasks = tasks.length > 0;
-  const timeframeHours = resolveTimelineHours(timeline.map((point) => point.timestamp), 12);
+  const fallbackHours = 12;
+  const rawTimelineHours = resolveTimelineHours(timeline.map((point) => point.timestamp), fallbackHours);
+  const timeframeHours = Math.min(rawTimelineHours, fallbackHours);
+  const isTimeframeCapped = rawTimelineHours > fallbackHours;
 
   // Prepare chart data
   const maxTimelineCount = resolveMaxCount(timeline.map((point) => point.count));
@@ -144,9 +147,16 @@ export default function MobileEventAnalyticsPage() {
               {t('analytics.activityTitle', 'Activity Timeline')}
             </Text>
           </XStack>
-          <Text fontSize="$xs" color={muted}>
-            {t('analytics.timeframe', 'Last {{hours}} hours', { hours: timeframeHours })}
-          </Text>
+          <YStack space="$0.5">
+            <Text fontSize="$xs" color={muted}>
+              {t('analytics.timeframe', 'Last {{hours}} hours', { hours: timeframeHours })}
+            </Text>
+            {isTimeframeCapped ? (
+              <Text fontSize="$xs" color={muted}>
+                {t('analytics.timeframeHint', 'Older activity hidden')}
+              </Text>
+            ) : null}
+          </YStack>
           
           {hasTimeline ? (
             <YStack height={180} justifyContent="flex-end" space="$2">