Play Time Monitor

Play Time Monitor helps parents to make sure, that the time their child spent playing games was really what he/she said it was. It taps into the system application usage statistics and displays a sorted list of all the games or apps used today, yesterday, last week or last year.
It is not restrictive (i.e. it will not stop the games from launching) and it can be installed and used even after the act. The main objective is not to restrain the child usage of the phone, but to hold him accountable to his/her promises. If he(she) promised to play at maximum 1 hour a day, this app gives you a chance to check and make sure.
Works on Android 5.0 and above (API 21).