5-10 minutes....that's what it normally takes for me to bust a tournament
No seriously, I think around 15 hrs.
Actually forced to play that long because of running deep in big MTTs.
Normally I'm definitely not a fan of very long sessions because it tires me mentally.
Also if ,say some day I play 8-10 hrs, most of the times the day after I just don't wanna play.
Like my brain has to recover from that long stretch of decision making.