I try to play at least an hour a day. It's actually been really useful whenever I've had problems in my real life and I need to step away for a bit. My family sometimes asks me how I can play games during certain difficult times and I have to explain that if I wasn't playing games I would be overthinking situations and be in a worse place.
Basically this. I don't have to play a game every day but they help me in this respect as well. Especially something kind of mindless like a Call of Duty or pub games in Counter Strike. Really clears my head and helps me calm down.
Other than that I'll just pick a single player game thats usually a huge time sink and play that exclusively for a while. Right now I'm going through Dragon Age: Origins cause I never got around to beating it at launch.