I've done games like Max Payne and Portal in 1 go, and I did also do Max Payne 1 and 2 in a single continuous run.
But the longest single game I played in one sitting was a full runthrough of Mass Effect, all the sidequests, levelled characters into the fifties, including DLC, in one playthrough. Clocked in at about forty hours.
I had prepared by getting food and drink ready (mainly drink) and I don't count toilet breaks into the overall time, because poopsocking is not something I even want to try.
But the longest single game I played in one sitting was a full runthrough of Mass Effect, all the sidequests, levelled characters into the fifties, including DLC, in one playthrough. Clocked in at about forty hours.
I had prepared by getting food and drink ready (mainly drink) and I don't count toilet breaks into the overall time, because poopsocking is not something I even want to try.