Sitting still for 18 hours and not eating, going to the bathroom or doing any human functions isn't exactly the healthiest thing to do. I'm sure they felt nauseated or such, but I doubt they had to go to the ER or anything.

I don't like to binge on video games (usually). Two or three hours and then I seriously need a break. XI is hard for me to play because I rely on people to be playing and they do the same for me. It's not exactly casual-fan friendly.