Cumulative time spent by user in App


Is there a way I can figure out the TOTAL time spent by ALL users in my app?
For example, if I have 100 users and everyone spends 5 mins on an average this month, I want to see 500 mins at the end of the month.

i think there is some way to track time spent but
if you use push notification, then one signal track time spent for each user.
you can check that in one_signal’s dash board
however you need to match one_signal id for each user