Today is another quick weekender: Longest Game Session Played. By necessity of age and responsibilities, answers to this question are going to skew heavily towards adolescence and college years, I should think.
For me, the answer is a simple one — I’ve really only done one marathon, back in the misty prehistory of 1983. A bunch of us got together in the summer at my friend John Cochrane’s house, in the late morning, and we played TOP SECRET and DUNGEONS & DRAGONS until the next morning. We took time for eating, and for sleep, but all told it was probably somewhere in the neighborhood of 18 hours of play.
Mostly, though, I keep sessions to a much more reasonable 4-5 hours at most.
Dave Chapman, however, puts my numbers to shame, in his video entry, with special guest Lynne Hardy of Modiphius: