Here, I’m going to “cheat” because while it might mean tabletop, my longest game sessions are always going to be LARPs.
So, longest LARP event I’ve been to was a four-day event, timing in at 6pm on Friday with a final time out at 3pm on Monday. Bearing in mind that Senate never times out at Empire, that makes for a 69 hour time in, even if I did spend about 18 hours of that time sleeping.
In terms of longest single time in period, I was thinking that would go to Projekt Ragnarok or even the last No Rest for the Wicked event, but given I crewed Ragnarok and was STing No Rest, it seems unfair to count them as a session played. So I guess I’m left with the 17 hours timed in from the last Empire event (wake up 10am Saturday, hit bed 3am Sunday).
To pad this out a bit more, I can add in travel times. The longest it has taken me to get to an event is 24 hours (travel from Shetland to Aberdeen to Edinburgh to Derby) and longest trip back from an event is 36 hours (same journey but in reverse with an overnight stop in Edinburgh).