I would love to know for sure. I've put hundreds of hours into Final Fantasy 8, Final Fantasy X, Morrowind, and probably Halo: Reach too.

World of Warcraft, EverQuest, and No man’s Sky

Sigh... Rust

One of the Paradox strategy games by a comfortable margin. It'll be one of the Crusader Kings or Victoria games. I've got a weekly game night with a couple of friends that was originally just CK, but has for a while now been working extremely slowly through a megacampaign. You can take the end of Crusader Kings and make it into a mod for the start of Europa Universalis, then repeat the process into Victoria and then Hearts of Iron. You need to set some rules for yourselves, because an experienced player doesn't need even a third of the CK timeline to demolish all AI threats, but the games are already good roleplaying fodder anyway so you can set rules that play into that. We're currently about three quarters of the way through Victoria

Outside of those, Noita or Deep Rock Galactic. For a while, those plus a podcast were my go-to "zone out brain off" relaxation, so the hours racked up

Elden Ring and StarCraft2

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.

Star Citizen (no joke, I have put more than 2000h in the Alpha...). But because some people may say Star Citizen is not a game (I'm not agree with that statement), the second game I have played the most is warframe (1500h)

Dark Age of Camelot. 6000 hours on my main character, and I had more or less ten characters… I’ll never beat that amount of dedication into a game.

Dota 2 around 3500 hours. Rust 1100 hours. Monster Hunter World 400 hours. Binding of Isaac 350 hours.

Persona 5 Royal

150 hrs and I'm almost done with it

For me it has to be either the binding of isaac or noita. It's hard to say since i played tboi on so many devices before i got a PC.

Stardew Valley, Skyrim, and Halo 3 probably top my list. I dumped like 400 hours into Stardew during Covid lockdowns and a few hundred more after

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

Planetside 2, Arma 3, and X4 Foundations.

Minecraft

Monster Hunter World. I usually stop playing games after I roll the credits, but I have been addicted to min/maxing in that series since Tri.

Top 3:

Escape from Tarkov: 14600h

Elite Dangerous: 3600h

The Division 2: 3200h

Talisman

That's a though one... there are more games in my library that I haven't played than ones I did.

Maybe Fallout or Neverwinter Nights. Or Silent Storm.

Yes, I'm old. And waiting for my retirement to play all of those I haven't tried yet.

Everquest by far. Then League. Then Diablo 2. I dont think theres any game that comes close to the total unrecorded amount of hours those 3 games have.

Pokemon, either Pokemon Sword or Pokemon Violet, I would have to look at the Switch itself to compare, but last I looked at either one it was around 400-something hours. Shiny hunting can be a surprisingly cozy time-waster, lol.

Easily Fallout 4 or No Man's Sky

Dayz, 3500hrs and still ticking.

Probably Warcraft Rumble.

Warframe, by a big margin.

R6: Siege at 1800, followed by Terraria at 1100. Terraria is the better game of the two.

It's either the Sims or Animal Crossing.

Skyrim and Satisfactory.

Kerbal space program

Craft the world, Valorant and AoE3

Over time: probably Contra on the NES, Tetris and Bionic Commando on the GameBoy, Operation Wolf and Sinistar in the arcade. DOOM, Duke3d, and XEvil on the PC. CS 1.6 and CS:S in college. The Gears series on the 360.

Then I had a decade or so gaming drought. More recently: Batsugun, Ketsui (Deathtiny and Death Label), Danmaku Unlimited 3, and Battlefield 2042.

The Total War series, I have 300+ hours on Shogun 2, Rome 2, Empire, and Warhammer 2 each. Almost 100+ on most others. Probably have 1000+ hours on League of Legends too.

On and off for over a decade I've played the original Borderlands on xbox360, so definitely that.

I have over 1500 cumulative hours invested in No Man's Sky and Minecraft respectively. I am a casual gamer. I started playing Minecraft in 2012 and NMS in 2017.