While 60 hours maybe a stretch, I do have a real life friend that was addicted to EQ and stayed up for 43 hours straight before passing out. I think he was camping a rare spawn, but I'm not sure. Such cases are rare however, and it's best to avoid any activity that gives your toon attention.
Longest time playing wow without sleeping without botting: 64 hours... oh man I srsly was addicted oO now max 4 hours for the occasional raid, before I start the bot, and even than lazyraider