I am looking to track how much time I spent "working" and "not working". I would like to use a chess clock for this. When I go away from my desk, I hit the player 1's timer, and when I get back to work, I hit the player 2's timer.
I think I found some Android apps that could work nicely, but if I need to switch apps or lock the screen, they all pause. Is there any such app that runs in the background? I use Android.