The page duration is the average time it takes to view a page expressed in standard format (hh:mm:ss).
The page view duration is calculated as the total time spent by visitors divided by the number of page views, where each page has a time.
Notice that the last action in a visit has no time since timestamps are only set at the beginning of each action. A page view automatically times out after 30 minutes inactivity (together with the visit). Thus, a page view cannot last longer than 30 minutes.