-        duration = parse_duration(
-            self._html_search_meta('duration', webpage, 'duration'))
+        duration_str = self._html_search_meta(
+            'duration', webpage, 'duration', default=None)
+        if not duration_str:
+            duration_str = self._html_search_regex(
+                r'Duration:</b>\s*(\d+:\d+)', webpage, 'duration', fatal=False)
+        duration = parse_duration(duration_str)