If we're counting every Pokémon game as a single one, then that. Otherwise, probably Skyrim. I must have like 2000+ hours across all of its versions.

Old-school RuneScape, 12k hours, another 6k hours on rs3 pre-eoc. Over the course of 21 years.

I quit a couple years ago for good, but my main account on RuneScape was created in classic as a kid. I had about a year and a half of PLAY time on the account, mind you the vast majority of that was back when you had the hard 5 minute afk timer, so that was at least moderately active play. Then if you add my ironman account I have nearly 1/15th of my whole life logged into RuneScape. I don't regret it, my whole friend group as an adult stem from those friendships I made online during my young teen years. However, as a modern game as much as I have a place for it in my heart, I found I had more of a negative addictive relationship with it. Maybe I always did, but I didn't feel a negative mental effect at a young age.

I have over 1k hours in The Long Dark and 7 days to die. Around 500 in space engineers, darkest dungeon, binding of Isaac, enter the gungeon, grim dawn, and satisfactory. ~300 hours in ToME4 and Caves of qud each. That's just steam stuff though, there are a lot of games that I know are up there that aren't on steam.

I'm sure I have at least similar numbers to 500-1k if not much higher in Diablo 2-3, and I'm sure more than a few thousand in wow though I lost my og account after wotlk because I forgot the details when I quit so I'm really not sure.

Factorio 5k+ atm

Unless we count pokemon, played that to death when I was younger, would be willing to say I have "young person time" amount of hours in the Gameboy versions.

Terraria. I don’t know why but the progression in the game feels so damn addicting. Mods add onto it by alot too

Skyrim and Satisfactory.

https://lemmy.world/post/22145712

Alley Cat

Factorio: 1300h
Fallout 4: 1100h