The most that I have proof of is Europa Universalis IV at a little over 1k hours, but I wouldn't be surprised if my time on Guitar Hero 3 in high school surpassed that by quite a bit. I played a lot of Guitar Hero in high school...

Civilisation, the original one. Got it in the 90s, and none of my computers was without it. Even now I sometimes launch it for a guick, half-day game.

I'm sure other Microprose games from that era, in particular UFO: Enemy Unknown, are on my top 10 most played games.

From modern games, I probably spent the most time playing Civ4 and Heroes of Might and Magic 3.

World of Warcraft - over 11k hrs

Guild Wars 2 - over 5k hrs

Warframe - 2200 hrs

Minecraft - who knows... a lot

The X3 games (Reunion/Terran Conflict/Albion Prelude) would be one game with DLC today, combined they're my only 1000hr+ game. X4 is one game with DLC and is well on it's way to that record.

Guild Wars 2 has been my theme park MMORPG of choice on and off for the last 12 years, with >2500h. I have also spent ~1000h on Elite Dangerous.

Probably still World of Warcraft. When I quite around 2010, I had close to 700 days /played time on my main, and another 400 days between various alts.

Probably counterstrike back in the day, possibly battlefield 2 including the Project Reality mod. That was back when gametime wasn't really tracked and I had a lot more spare time Possibly WoW, but I only played for a couple of years or less and for a few hours a day at most.

Currently my highest is Forza Horison 5 with like 1200 hours. Have a few others with 500+ hours although a few are inflated at least 100+ hours because the game locked up on closing and counted as played for several days multiple times.

DayZ, I have around 3000 hours in it.

As much as Monster Hunter is my favorite series of all time, and I have about 1600 hours combined total over several games, it's still not caught up to my total of over 2000 hours in Warframe. Love that game to bits but yeah I think I played it enough.

Most other games I play, that I played a lot, hover between 100 and 300 hours each.

7 Days to die. 1600 hrs on steam Call of Duty. 1200 hrs on steam

The Binding of Isaac

Elite, the original one, on Commodore 64.

I have few hundred hours in Minecraft. And probably something like 180h in Witcher 3 GOTY. Recently I 100% Yakuza 5 with 120h on the counter, and it was (mostly) fun, because game is packed with many different minigames, so it wasn't repetetive.

Easily Fallout 4 or No Man's Sky

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.

Planetside 2, Arma 3, and X4 Foundations.

Dayz, 3500hrs and still ticking.

I'm approaching a thousand hours in Elite Dangerous. Quoting myself from a week or two ago:

It’s different to most other games, by not being goal-oriented except for the goals you set for yourself. No main quest line dictating progress. No mandatory tasks. No win condition. Instead, it drops you into a simulation of our entire galaxy roughly 1300 years in the future, where humanity has mastered hyperspace travel and spread through hundreds of star systems.

(To give an idea of the simulation’s scope: Around 85 million systems have been recorded by players so far, and those are a vanishingly small fraction of what’s out there. Space is big.)

I like that it offers a variety of activities to fit whatever mood I might be in on a given day. I can hunt pirates, mine asteroids, engage in a bit of piracy myself, find and collect bio samples, infiltrate rival settlements, venture into vast unexplored areas of space, discover Earth-like worlds that nobody has ever encountered before, defend humanity against hostile forces, photograph beautiful stellar phenomena, rescue stranded survivors, customize and finely tune my ship to perform beyond its original specs, team up with friends, pledge to a political power and expand their influence, or chill out as a space trucker and haul cargo to earn enough money for my next upgrade. It can occupy all my attention, or just be relaxing entertainment while I listen to music or an audiobook.

It’s an MMO in the sense of having a large game world (galaxy) shared by all players in real time, but PvP is optional. One mode exposes you to other players, while another limits you to NPC encounters. You can switch between them at will.

One warning: A space ship has more than a few controls to learn, and they’re better suited to a game controller or HOTAS than a keyboard and mouse. I use button combinations for almost everything beyond basic flight controls, since there aren’t enough buttons on a controller for everything.

Warframe, by a big margin.

I put the most hours into Awesomenauts during college... really miss games that time

I have a lot of hours of Morrowind and Doom 1&2, as well as Warcraft 2 and Ultima Online, but I dunno the hour count

Team Fortress 2 easily. Been playing since 2008. It scratches an itch that no other game can scratch. Ironically though, my second favorite fps game is also TF2 (Titan fall 2)

It's either the Sims or Animal Crossing.

WoW, Grim Dawn, Don't Starve (Together), Stardew Valley, Terraria, Skyrim, Borderlands

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

STALKER and The Elder Scrolls probably hold the record. I may have wasted even more time in my life on World of Warcraft, but I feel like that doesn't count since you're just in a fucking trance for several years until you finally break away.

Craft the world, Valorant and AoE3

KSP

Skyrim and Satisfactory.

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.

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

I have over 3K hours on rust on PC. If I include all the hours on Xbox when I was younger it would most likely be either destiny 1+2 or Rianbow Six Siege but Im not sure how to find all that info since alot of R6 was on Smurfs

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)

Elden Ring and StarCraft2

Civ all games and Apex legends with like 6k or more hours.

Apex is from day 1 launch day.

Maplestory and Warcraft 3 almost certainly hold the first two places from an age gone by, but I don't have numbers for those.

For games that I do have numbers for, Anno 1800, Stardew, and Total War Warhammer (especially if you combine the trilogy).

XCOM: War of the Chosen

Overwatch (gave up on blizzard a couple of years ago though)

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

Final Fantasy 6, because I have played through it on SNES, PS1, Rom, then SNES again.... oh, and there's 500 hours in Slay The Spire. Maybe also Civ 3.