You can't track them, but you can make educated guesses. There's a finite amount of time in a day. So for 1) they must have been doing something during that t

You can't track them, but you can make educated guesses. There's a finite amount of time in a day. So for 1) they must have been doing something during that time they were off reddit. They could have picked up cooking or moved to a non-hating online platform. If so, that's a win anyway. For 2), that's possible, they would have to do it by reducing another activity. Given that reddit is designed to eat all your free time, I find it unlikely.