Well in the early 80's myself and a group of friends would think nothing of 3 even 4 day gaming marathons without sleep. We would eat and drink and smoke, whilst wearing out the rubber keys on our speccys. One by one we would either fall asleep or disappear to our beds. 48 hour gaming sessions were very common place. This went on for years with the Atari and the Amiga being successive platforms. Now at my age I don't think I am physically capable of playing games for more than 24 hours non stop. To be honest I don't even try any more. I still have the occasional 16 hour session though.