That was strange, I have logged in about 65 hours (with breaks to go to the toilet, eat and walk for 2-3 min every few hours) and never had any problem. I was much younger at the time, but still. (then I was asleep for about 13 hours, my second most high record sleeping)
Of course it is not healthy at all. There is also blood clotting that might cause a problem.
Nowdays I can barely play about 4 hours in a row without the need for a break, even if it is 20 min one.
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