I once played a tournament for 36 hours in a row non-stop. But before that, I was very well prepared in terms of food, drink, exercise during breaks and distraction. This is a fairly difficult task, but doable. The quality of the game, of course, decreases by the end of the session, but it happens that you don't want to miss tournaments that happen once a year, for example.What is the longest session of poker you have ever played? I played for a little over 11 hours in one seasion. I think thats the longest i have ever played in one session. I had to stop playing because towards the end i was getting sloppy.