If we count map editors then most likely C&C: Generals: Zero Hour or ARMA 3.

If we don't could editors then probably Halo 3 or MW2, maybe Stellaris.

Before the community died off I had put just under 20,000 hours into Subspace / Continuum (mostly on EG). No, that's not a typo. I learned what addiction looks like as I grew older.

Between that, NexusTK, The Realm and an unhealthy obsession with SNES JRPGs I don't know how I managed to make it through grade / high school...

I probably have years of playtime on Super Smash Bros. Melee for Nintendo GameCube

CS:GO 5000+ hours wasted in my 20s

I believe the game I have the highest number of hours in is League of Legends, but I don't know the exact amount because at a certain point riot changed their API and the tracking site I used reset. But the highest it was ever at was 2,376 hours. The highest games I currently can still track are Skyrim with 789.5 hours and Skyrim legendary edition at 241 hours, then Stardew Valley with 953 hours, Fallout New Vegas with 612 hours, and Final Fantasy 6 with 557 hours(this was one campaign.). Everything after that is sub-500, but I give an honorable mention to Dark Souls 3, at 441 hours.

Dead By Daylight has consumed more of my life than any other game at 1600 hours (since 2018), and that’s still rookie territory. I’ve never been able to commit to a game for very long, maybe 40-80 hours max and that was only two or three games in my life. DBD just has a hold on me.

Risk of Rain 2, man. My absolute favorite game of all time.

What, recently?

Historically, Destiny or Borderlands, probably the latter. But lately, I'm spending all of my time in Factorio.

I haven't looked at the hours stat; it'd probably only depress me.

Idle Wizard 6k+ hours

NGU Idle nearly 4k hours

MHR Sunbreak 1k+ hours

BattleTech 1k+ hours

MH World 800 hours

Those idle games running in the BG sure racked up the hours. Ran them for more than half a year before I realized I was just wasting power for something senseless.

I have nearly 3500 hours into Apex Legends (played competitively a little in college)

Also somewhere in the realm of 800 hours into factorio, a good 500 into Skyrim and literally uncounted thousands of hours into minecraft.

The Elder Scrolls Online

Easily 10k hours throughout the Diablo series.

Over 750 hours in Total War: Warhammer II.

Probably 2,000 or so in Guild Wars 2.

Looking at 600+ hours in Rimworld, and probably even more in Dwarf Fortress but 200+ since the Steam release, it wasn't tracked before.

Probably Terraria

Call of Duty Modern Warfare

Either Sims or Transport tycoon Duluxe

Path of Exile, around 3k hours and it is still my favorite. Every 3 months you get to play again with a different twist, and Path of Exile 2 (just an update, but a huge one) is being worked on and will likely release next year.

League of Legends, no doubt (and no idea how many hours across my two main accounts). Just... yikes on a bike, that one.

Other tops probably Sims if I can count all the different games. Stardew and animal crossing are up there as well, I'm sure.

Old School RuneScape, by a lot!

I'm over 10k hours on FFXIV, been playing since launch. Could get an exact answer when i get home. Next closest is Skyrim with around 1,500.

Edit: it's over 14k hours, more than 584 days worth. It'd be much more if I had more time the last two years but I can't do much than dailies with a 15 month old!

1200 hours on Halo The Master Chief Collection on steam. And absolutely countless more on Halo Reach on the Xbox 360.

Quake Champions for sure. Best competitive shooter I've ever played (and I've tried all the popular ones), great option if you like movement & aim centric games

AOE II was my childhood. I played that game for years.

I would guess I have multiple thousands of hours across the Halo and Pokemon series. My highest played steam game is dead by daylight (gross) at 1k hours. Deep Rock Galactic and PUBG are at around 500.

1. RDR2 - 2,225 hours
2. MGSV - 1,388 hours
3. TW3 - 645 hours

I'm sure SMW is the real 3rd. place, but I don't have the numbers.

Ultima Online for sure. Glad the time wasn't tracked...

Guild Wars 2; I'm at 6-7k hours or so. Been playing a lot less lately; I'm not sure if that's the recent content, or if it's me getting tired of it. I don't have a ton of objectives I'm interested in completing at this point; some "nice to have"s, but at this point any character or build I could possibly want to play, I have just about everything I need for. Mostly find myself logging in twice a week to do guild night with friends, and that's it.

Otherwise, GTA V, which surprises pretty much everyone I know except the friends I play with. It's just such an easy game to spend hoursblowing each other up or racing around or whatever in; really a fantastic game to play with friends.

Probably Planetside 2, an online MMOFPS game.

Next are probably: (Don't know in which order)

FTL: Faster than Light (with Multiverse Mod)

The Elder Scrolls 5: Skyrim

A small multiplayer game called "Red Crucible 2" (browser based FPS game that runs in Unity Plugin, game's now dead)

GTA V

GTA IV

Note: I don't have the times on these games because I might or might not have "downloaded" some of them outside of official stores... so its just based on how vividly I remember them.

Pokemon Firered. One of my favorite childhood game.

Overall i've spent countless hours in minecraft and csgo for a close second

Recently tho I've been playing a lot of bloons and risk of rain 2. They're both really addictive

I don't know how much time I've spent in Minecraft, but it's probably over 1000 hours.

Second place certainly goes to LoL. They reset the statistics at some point but my guess is also close to 1000 (at some point I had like 700 and kept playing for a while).

I don't play either of those anymore though.