dude when my friends come over to my dorm well smoke 4 hours plus. it is so much fucking fun because, as you can imagine, after 4 hours of smoking, not everyone's head is in the right place lol. it sucks that your friends quit on you though. sometimes, i smoke just so my friend doesnt have to smoke alone you know. besides, how can they leave a perfectly good bowl of shisha unfinished?!?