How to count time between game sessions?

Hello everyone,

For my game I am trying to create a system that count gameplay time and if the player plays more than lets say 4 hours then negative buffs will be applied until he rests.

Resting time will be valid only if the player in not playing. So for example if i set 8 hours until full rest, the game needs to know that if the player comes back after 8 hours, the negative buffs will be removed.

In case its helps, the idea behind all this is to create some kind of anti-addiction system in games.The game will be offline only.

It would be greatly appreciated if someone could explain or point to a direction on how to be able to count the time between the game sessions so i know the player actually did not play for at least 8 hours.

I'd use a combination of onSuspended condition and Unix time (https://en.wikipedia.org/wiki/Unix_time).

You'd simply record the Unix timestamp when the user closes the game (onSuspended), and then subtract this number from the Unix stamp when the game is opened again - if the number is greater than 28,800,000 (8 hours in milliseconds), then you know that 8 hours or more have passed.

The one thing I'm not sure on is if onSuspended is called if the app is closed rather than suspended