diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/call/CallWidgets.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/call/CallWidgets.kt
index 8e7041e7d6..faaa4d5eb9 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/call/CallWidgets.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/call/CallWidgets.kt
@@ -50,6 +50,8 @@ import androidx.compose.ui.unit.sp
 import androidx.compose.ui.viewinterop.AndroidView
 import com.vitorpamplona.amethyst.commons.resources.Res
 import com.vitorpamplona.amethyst.commons.resources.call_calling
+import com.vitorpamplona.amethyst.commons.resources.call_duration_hours_minutes_seconds
+import com.vitorpamplona.amethyst.commons.resources.call_duration_minutes_seconds
 import com.vitorpamplona.amethyst.ui.note.BaseUserPicture
 import com.vitorpamplona.amethyst.ui.note.ClickableUserPicture
 import com.vitorpamplona.amethyst.ui.note.UsernameDisplay
@@ -400,10 +402,28 @@ fun GroupCallNames(
     }
 }
 
+/**
+ * Elapsed call time as a clock: `05:23`, and `1:05:23` once the call passes an hour.
+ *
+ * Hours are not folded into the minutes field — the previous version rendered a 65-minute call
+ * as "65:12".
+ *
+ * The pattern comes from a string resource rather than a literal so the separator and field
+ * order stay the translator's, and so the numbers are formatted with the locale Compose is
+ * configured with. `String.format` without an explicit locale follows the JVM-wide default,
+ * which is not the same thing in an app that has its own language picker.
+ */
+@Composable
 fun formatDuration(seconds: Long): String {
-    val mins = seconds / 60
+    val hours = seconds / 3600
+    val mins = (seconds % 3600) / 60
     val secs = seconds % 60
-    return "%02d:%02d".format(mins, secs)
+
+    return if (hours > 0) {
+        stringRes(Res.string.call_duration_hours_minutes_seconds, hours, mins, secs)
+    } else {
+        stringRes(Res.string.call_duration_minutes_seconds, mins, secs)
+    }
 }
 
 @Composable
diff --git a/commonsUI/src/commonMain/composeResources/values/strings.xml b/commonsUI/src/commonMain/composeResources/values/strings.xml
index 053702457f..0cdb97a43e 100644
--- a/commonsUI/src/commonMain/composeResources/values/strings.xml
+++ b/commonsUI/src/commonMain/composeResources/values/strings.xml
@@ -1296,6 +1296,11 @@
     <string name="call_calling">Calling\u2026</string>
     <string name="call_connecting">Connecting\u2026</string>
     <string name="call_ended">Call ended</string>
+    <!-- Elapsed call time. %1$d is minutes and %2$d seconds in the short form; in the long
+         form %1$d is hours, %2$d minutes and %3$d seconds. Separator and field order are the
+         translator's to change. -->
+    <string name="call_duration_minutes_seconds">%1$02d:%2$02d</string>
+    <string name="call_duration_hours_minutes_seconds">%1$d:%2$02d:%3$02d</string>
     <string name="call_dismiss">Dismiss</string>
     <string name="call_switch_camera">Switch camera</string>
     <string name="call_voice">Voice call</string>