Definitely Skyrim, across multiple editions and platforms. And I’m proud to say I never sank into the stealth-archer habit. Armored mage FTW muthafucka!

I can say with certainly that the game I have played the longest is Warcraft III.

Now the most hours played… phew.. hard to say. It is either Warcraft III or World of Warcraft.

Official? 4000 hours in Left 4 Dead 2.

Unofficial? Easily over 10,000 hours in Sven-Coop (a multiplayer Half-Life 1 mod).

I started playing Sven-Coop when it was released in 1999. I play at least a little almost every day I'm not out of town. I moderate some servers. I show new players how to beat hard levels. People still make new levels. Sven-Coop wasn't added to Steam until 2016, so the hours weren't tracked until then. Since 2016 I've racked up around 4000 hours. Factor in the 16-17 years of gameplay that wasn't tracked and I easily have over 10,000 hours.

I'm not sure I'd want to know the exact hours even if I could.

Legend of Zelda - Breath of the Wild.

its an unofficial number but rock band 3 i used to play every day, 5-8 hours a day. for around 3 years

Probably Ultima Online if I had a way of checking.

I used to play that game all day, every day I wasn't in school from 1997 to about 2004. I even still play it on occasion, just not on EA's servers.

Based on what Steam has recorded, ARMA 3. But I know for a fact that many hundreds of hours in that was just the game running in the background on the map editor while I typed up scripts in notepad++. TF2 is the next highest one, and that game was like UO again for me from 2007 to 2014.

I seem to get obsessed for 7 years and then just drop things.

Probably Animal Crossing New Horizons with like 450hrs

I get bored so quickly of games, I don’t understand how some people manage to put several hundreds of hours in most games they play

Well, according to Steam, the answer is a tool that used to be available to adjust GPU fan speed. At the time I had a video card that wasn't letting the OS adjust that, or maybe I didn't have the right driver, I don't really recall enough details to retroactively troubleshoot it.

But if I didn't use that even the least demanding game would very swiftly overwhelm the card because it didn't have any heat mitigation, so any time I played any game I would also open this tool and crank the fans to max so I didn't have to pay attention to them (I had headphones). It also wasn't that uncommon for me to forget to close it since it ran in the background once configured. In fact, it looks like I have even more hours in that than I do in EVE Online.

Doom 2. Played since it first came out and played tons of mods

Steam says, out of those I have in my library there, Rocket League. But it's relatively closely followed by GTA 5, which I've also played on a console (those hours wouldn't be counted there), so I suspect that that's the real answer overall. GTA 5 is just a wonderfully deep game with an entertaining story where you can almost never run out of things to explore.

It's possible that Pokémon FireRed or Emerald has even more, that was too long ago for me to know for sure.

Fallout New Vegas at 200 hours

GTA Online is my most-played game according to Steam, but that time is largely skewed from how rough the game was upon its original launch. Rather than put up with nearly hour-long loading times whenever I wanted to play, I used to simply leave the game running overnight. And as a result, I've got a few thousand hours in that game.

Project Zomboid is a distant second according to playtime, currently around 900 hours, but I think I'm catching up to it in terms of time I've spent actually playing the game.

Something about sandboxes with cars and guns that just scratches a certain itch for me.

I've also got at least a few hundred hours on iRacing, but because I haven't linked that to my Steam account, I don't know the exact amount of time. And I'm not going to look back through my race history to add up every minute of virtual track time.

My top nine, according to steam

Most are so high because I lucked into finding a group of players I could really hang with.

Not sure which game individually, but I have about 9600 hrs in SteamVR

I have 5133 hours in Transformice. It was pretty much the perfect game for me at one time.

It may look like a silly nothing game, but the skill ceiling is almost non-existent. I felt like I was improving for every single hour I put in. Made a lot of international friends, too.

I have spent around 2000 hours in Gmod. A sizable percentage of those hours involved trolling the people who play TTT. Escapades involve kicking off a detective civil war, provoking people into offing half the server, and spamming admin messages and false reports. The gamemode has fallen out of favor these days, so I only really check out interesting Gmod maps and nextbots now.

KSP, for sure.

Terraria

1055 hours!

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All in all probably Overwatch. It recently overtook HoI4 in most hours in my Steam library.

I don't have a log of hours

I don't play it on Steam

but I'd be pretty confident that it'll be Cataclysm: Dark Days Ahead.

https://en.wikipedia.org/wiki/Cataclysm:_Dark_Days_Ahead

I haven't played in a long time but EU4. I had thousands of hours of playtime after about ten years.

For me it was when i was in high school, the space autism got me and i played something like 4000 combined hours in space engineers.

I don't even like that game.

I don't have that much free time to play as an adult anymore and steam is only tracking game time from adulthood.

Mostly a mix of ARGPs and industry games, because the mechanic is engaging, simple and repetitive. I generally avoid story based games as by the time i can play again, I've forgotten what the details of the story we're about. I need the "in last episode" for story based games.

Top3.

POE 891h. It's a really good ARPG game. Satisfactory 538h, industry part. WH 40k Inquisitor(combined) 532h, Warhammer themed ARPG.

Guild Wars 2 with 9405 hours as of just now. Non-predatory MMO with fun moment-to-moment gameplay

The most that I can prove is Europa Universalis 4, just north of 1100 hours on Steam. However, I strongly suspect my playtime in Guitar Hero 3 from high school likely exceeds that. Runescape might be another contender, but that was so long ago at this point that I don't really have a good idea of how much play time I actually put into it.