The Session Duration feature in App Analysis shows how long an average user is in each session for the selected app(s). This feature breaks out the Average Duration of a session into subsets that include: 0-3 seconds, 4-10 seconds, 11-30 seconds, 30-60 seconds, 1-3 minutes, 3-10 minutes, 30-60 minutes, and 1-10 hours. With this tool, you can determine how long people are using the selected apps and the standard lengths of each of their sessions. This used in tangent with the Session Count feature can illustrate how much your users are actually using your app. 

Understand how users are using an app to identify when to run potential ad campaign to affect the highest number of users. 

Below the graph of the Session Duration, there is a table with more details into the data from the graph.

All of this data is also Exportable to a CSV via the blue Download CSV button.