When I was younger and got Kingdom Hearts: Chain of Memories for the GBA I literally played for nearly 24 hours straight. I got it for Christmas and literally played the entire Christmas day and through the night. I played so much that I got callouses on my thumb from the D-Pad.
When I was a young teenager (like 12-14) Animal Crossing was the closest thing I had to a social life, so I would often spend all day playing it, only stopping to go to school, eat, sleep or use the bathroom (and even then I often took my DS to the bathroom with me, don’tjudgemepls )
Really couldn't say...but, probably no more than 10 hours. There are definitely a few games that I've played incessantly on the day of release. But, I don't think I've ever played more than a solid 10. I think I'd feel like too much of a bum if I ever did that. Even 10 might be a stretch...as I'll usually play a game for 4 or 5 hours, turn it off for an hour...return to it and play for another 3 or 4 hours...but, there's usually some sort of break in the middle...even if it's half an hour, or 20 minutes. Lol.
as a kid ive probably logged more hours in then i should ever need, but recently i finished all of birth by sleep in one sitting. probably a good 16 hours or so, half of which were spent on trying to figure out a boss fight during the ventus route ( i was underleveled because of how fast i was running thru the game HGFHGFGH )
animal crossing is coming close tho i actually hurt my wrist terraforming so much so. im takinga small break!
I have a distinct memory playing Sims 2: Castaway on the wii for 13-15 hours straight when I first got it. But I probably beat that record somewhere with Sins 2 on PC