When I was serious about the game, I used to play for around 5 hours per day on average, doings drills alone.
I found it diffucult to maintain concentration beyond this, which would lead to forming bad habits.
If I had a break from the game, it would take me several session to be able to build up to 5 hours of focused practice.
I would play against others a couple of times a week, sometimes for 12 hour sessions.
I would turn off music, prefer to play at home than in clubs where people come up to ask for a game or just to make some silly comments.