I played Metal Gear Solid 4 in one sitting with my best mate. That must've been 18 hours or so.

About 16 hours for Twilight Princess, it was actually two 8 hour sessions, one of which had a short meal break where I just paused, and inbetween them I turned the machine off for 45 minutes for dinner.

That's pretty intense, I can't even imagine playing 80 hours of Duck Hunt.

I'm not too sure about mine, perhaps Team Fortress 2 a while back. Probably spent close to 15 hours some days on it.

16 hours with "Skyrim" - ordered in all of my meals - was the longest I've done since I was a teen. I played "Legacy of Kain: Soul Reaver 2" for nearly 24 hours back in middle-school (6th grade). Most of that was loading screens, though ;)

In all seriousness, that game had terrible load times. "Bloodborne" reminds me of it in that way. Both great games, despite the performance issues.

Either Mario Galaxy 1/2, Pokemon Crystal, Persona 4 Golden, or Lost Odyssey.

I want to say Mario Galaxy as I played that nonstop for like 15 hours.

Borrowed World at War from my neighbor, spent the whole day, from morning to around 11 pm, playing the campaign on hard difficulty.
So many deaths on the last attack on Berlin.

I think close to ten hours. It was either Nintendo Land (when I got my Wii U), or SSBU.

14 Hours Red Dead Redepmtion with one friend all day/night long :D

Would love to do that this year in Red Dead Redemption 2 again^^

I remember spending a weekend trying to beat Mario RPG in one two-day rental. Dunno how long I played, guessing 8am to 1am Saturday, then 8am to about 6pm, at which point I was told in no uncertain terms to "turn that game off so we can return it, I don't care if you're fighting a smithy right now, turn it OFF."

My longest gaming session has to be World of Warcraft related. Back in the day when PVP ranks were serious business I had a span of 6 to 8 weeks where my group would pvp for 12 to 14 hours a day every single day just to not drop in rank.

I don`t remember my longest single gaming session but it had to be leveling to 60, I had a couple of 30+ hour sessions.