I can’t remember exactly, as this would have been in 1988 or ’89, when I was living in Philadelphia, but there were several all day/evening games that would run for 8-10 hours. These were usually either superhero games using the DC Heroes RPG by Mayfair, or spy games using James Bond: 007 RPG. I do remember one ended with everyone sacked out on my massive studio apartment floor well after midnight, while I was getting busy with one of the female gamers in the closet.

Ah, good times…