DS10 started playing Minecraft several years ago, and had some serious behavioral problems because of it. We wound up limiting it to two hours on Fridays and Saturdays. Not Sundays, because the worst behavior was usually the day *after* playing. Having a timer was very helpful (it's not Mom telling you to stop, it's the timer), but I always a separate time going on my phone, because it was just too easy to cheat. He also couldn't play for two hours straight; it was two one-hour sessions.
Although he still sometimes has problems immediately after screen time (transitioning to the real world), overall it's much better and we don't limit it as much. At 6, though, he didn't have the same capacity and needed us to limit for him.
