Improve duration display

agenda/types.py

@@ -268,6 +268,26 @@ class Event:
             else None
         )
 
+    def display_duration(self) -> str | None:
+        """Duration for display."""
+        if self.end_as_date != self.as_date or not self.has_time:
+            return None
+
+        assert isinstance(self.date, datetime.datetime)
+        assert isinstance(self.end_date, datetime.datetime)
+
+        secs: int = int((self.end_date - self.date).total_seconds())
+
+        hours: int = secs // 3600
+        mins: int = (secs % 3600) // 60
+
+        if mins == 0:
+            return f"{hours:d}h"
+        if hours == 0:
+            return f"{mins:d} mins"
+
+        return f"{hours:d}h {mins:02d} mins"
+
     def delta_days(self, today: datetime.date) -> str:
         """Return number of days from today as a string."""
         delta = (self.as_date - today).days