My longest gaming marathon was finishing Betrayal at Krondor one summer night in 1993. I think I started around 4-5 in the afternoon and finished it at like 2-3 in the morning.
But, I do sometimes work for a guy who rents some space in a large wharehouse, nothing special you may think. think again because its also used as storage for some media thats going to the local prison to be destroyed (dvd movies, music cd's Games) and being the compassionate and kind persion I am i feel its my holy duty to liberate the Gaming Goodness from such a fate, so it may live on
I've done 5PM to 3AM before, but that's got to be a record for me...and was before too much work and kids and all that...although I sometimes manage a 10pm-2am run...