I once played a guy for 38 consecutive hours. We were playing 8 aheads for 100 lol. It was at my friend's place, he had 4 pool tables and just let people play as long as they wanted just tip him if you ever made a score, no pool time. He just loved having folks around and being close to the action. This was in the early 2000s and I was maybe 22-23 at the time. I was so broke I really needed it bad. My friend was staking me. I had the guy 4 sets down and was on the hill to go up 5 sets and just couldn't finish it off. He was doing something to keep him going(never saw it but yeah) but I only ate dry cereal the whole time. So at the 35 hour or so mark I started getting kinda delirious, soon after that I was throwing up in the bathroom a little, soon after that I couldn't keep anything down not even water. I told the guy I would play him another time but he insisted we keep going. So after 2 more hours of this I just couldn't hardly stand anymore much less run a rack and I offered to give him a set back for free if he'd just quit. Hardest 300 I ever won.