I usually play about an hour and half to 2 hours at a time then take a break and come back. Ill play anywhere from 4-8 hours at a time though with several breaks in between. I found it was easier for me to play longer lengths of time playing tournament than cash though. That could have been because once you in a tournament you have to play til the end and when you have 3-4 tournies going at one time the breaks never fall together.