It depends on the success of the game. I used to play very long without a break. It used to be that he forgot about time and only because of fatigue, when he reached full exhaustion, he finished the game. My maximum is 26 hours in a row, but it was a long time about 10 years ago. Now I play 1-2 hours per day, if I go far in the tournament, then I can stay at the table for 5-6 hours, but the heat