Came here for d2. It ruined my life. I’d say longest time was 18 hours straight. PvP
So I've answered this before, but here goes again.This will age myself, and likely a few others, lol. I would also like to say this is the reason why I don't play Diablo anymore, and my gaming buddies all have the saying "friends don't let friends play diablo."
When Diablo 2 was released for PC a billion years ago, it was life changing for many of us. The online play was just unreal. Mephisto runs were all the rage. Fast forward to the expansion being released "lord of destruction." Two new characters were added with this release in the assassin and druid, as well as a reset of the online leader board. We all knew this was coming and so many players started prepping for the leader board reset, including myself and my friend.
Upon release my friend and I wanted to be number 1 on the leader board for first player to max level with either the assassin or druid class. We chose assassin. My friend and I stayed up for 48 hours straight, taking turns napping and quite literally feeding each other pizza and mountain dew to survive. We didn't get first, but we got the second place on the leaderboard. A pretty great achievement but the sacrifices like sleep and overall cleanliness probably weren't worth it. Also shortly after it was figured out by the community that you could power level a toon to max level by cheesing with a friend and you could max out a toon in like a day lol. Combine that with non stop meph runs the game was fairly broken.
I'm not sure I'm proud of gaming for that long without showering or really sleeping, but hey, it's a memory.