Games

Kerbal Space Program

I’m well above a thousand hours on the first game. Then all my flying sims (MSFS, Xplane, DCS, Elite Dangerous) also have a very high hour count. But for civilian airliners most of those hours are spent AFK in cruise.

Project Zomboid, Valheim

I am Not even close to 1000h but devinetively Factorio. Be aware, this game is a massive time sink and makes you play for way longer than you want. Especially with the new expansion you can spend enormous amounts of time in this game.

Path of Exile.

I'd say I'm a fairly mid-tier player, get better with each season I play, the breadth of mechanics and depth of complexity is mind breaking. I've only played like 2000 hours though, I'll get it all figured out eventually... Right?

Rocket League

Team Fortress 2

Dark age of Camelot. 6000 hours on my main character. I prefer not to think about how could life be different now if I had not started this game…

Ark.

Stellaris. I'm almost at 1400 hours in the game and while I now play it a lot less often than in the first 1000 hours, I still get the itch to play it again a few times a year.

Dark Age of Camelot

Guild Wars 2, so far I put 4,800+ hours into it.

I like that it has so many kinds of solo and group content that I can just do whatever I'm in the mood for that day.

Pavlov VR

The Binding of Isaac

Path of Exile. Hands down.

I just broke 1400 hours and still going strong. There's so much to do and so much to learn, and it's so good at rewarding grinding and keeping you chasing those incremental improvements. It's 100% replaced RuneScape for me.

I have broken 1000 hours with Cookie Clicker, Guild Wars 2, RuneScape, and Eve Online. I don't recommend the latter two anymore, but CC and GW2 still hold up.

Honorable mention to Factorio. I'm still in the hundreds but it's climbing.

Slay the Spire

Factorio, Warframe, Minecraft, Dota 2. However, the only two I'd still recommend are Factorio and Minecraft. Warframe's grind seems to have finally burned me out for good, Dota 2 is bad. You're not gonna have fun with Dota 2. The game concept is good, but like most competitive online games, the community fucking sucks.

In addition to Factorio and Minecraft, try Voices of the Void, The Long Drive, WEBFISHING, and Balatro.

Edit: oh yeah, and personally I have both Sims 2 and Sims 4 w/ all DLC (yeah, I toootally bought all the dlc) installed on my steam deck. Both fun games with their own ups and downs. Sims 2 is great vanilla, Sims 4 is great when heavily modded. Don't bother downloading the F2P version of Sims 4 from Origin if you're wanting to mod it with stuff like sacrificial's mods. Those'll break with every major update (and sometimes minor updates too!) and you can't pause updates anymore. So, you'll have to find alternative methods.

If it clicks with you Monster Hunter (World+Iceborne’s a good starting point) can easily eat up hundreds of hours of your time grinding and doing endgame content, especially if you have a group to play with.

Mine are:

Any Fallout or Elder Scrolls

Diablo 2 or 3

Stardew Valley

Borderlands 2

And I never consider it a real game, but I do sink the most hours in Hearthstone. I've been playing it almost daily for the past ten years.

The only two games I have that much time in are Factorio and Satisfactory.

Why do they have to be 1000 hours? If you’re getting gaming fatigue you’re not going to fix that by sticking to the same genres you always play. Go onto Steam/gog/eshop/etc during the Black Friday sales next week and buy a big pile of 40 hour games for $3 each

(Mine is FFXIV, to answer your question)

I don't think I've ever played a game more than 200 or 300 hours.

The Elder Scrolls Online was my first 1,000+ hour game, but it's since been long surpassed by Dead By Daylight.

Minecraft. Probably have around 5000+ hours I think. Playing since I was 10(now 17). So, many wasted hours on Anarchy Servers and Ranked Bedwars.

Space engineers

Final Fantasy XI. I'm almost exactly 1,000 hours into it, and only halfway through the storyline. I haven't even touched end-game content. I'm playing on a free private server called HorizonXI that is well-populated and feels more like the game when it came out versus the modern day solo experience.

Morrowind. Although it's more like play a few hundred hours every five years for me.

Rimworld, and Football Manager (although they last one I played is 2020)

Regarding the question itself, Starbound and Minecraft. Maybe Final Fantasy XII if I was to play it multiple times, as I take at the very least 100+ hours to finished it, and 250+ if I'm not in a hurry.

But regarding gaming fatigue, perhaps it could be a symptom of playing too much of only a handful of game styles? If you wouldn't mind, may I suggest to check some smaller games in length and scope, specially indies? Those tend to be rather diverse in their scopes and executions.

Somehow ctrl+f failed to find this one, but Path of Exile is probably my drug of choice there. While I raked in 1k hrs with Dota2, I'm not sure I"d recommend it unless you really want to sell your soul to MOBA life. And it's not quite to 1k yet, but honorable mention must go to Satisfactory as it's well on its way to being game #3 in the 1k+ list with me.

Apart from Flight Simulator 2020 and DCS, I absolutely love games like Euro Truk Simulator 2 and Snowrunner. I put ungodly amounts of hours into those. Especially ETS 2 is incredibly relaxing. No pressure, just a lovely drive. It’s definitely not for everyone though.

Don't Starve Together scratches the MMO itch for me. It's not an MMO, but there are public servers where you can hop in and hang out, raid bosses and whatnot. I have ~4k hours in it now.

If you like space games, X3 and X4 can probably eat up lots and lots of your time. Space Engineers if you're less interested in flying, space economics and creating a supply chain (which X lets you) and more in gathering materials and creating all sorts of weird, funny or actually amazing stuff. SE is probably better played with at least 1 other person, possibly more, while X is exclusively single player.

Grand Strategy games can also obliterate your free time. Civilization 5, any Total War game. Hell, Age of Empires 2 can have very long matches if you play on huge maps and people have loved that game for over 20 years.

You can also go for Fallout 4 or Skyrim with extra content mods, like dungeons, quests or areas.

Personally, I'm just past 400h on Palworld, so I'd recommend it as well. I've played from start to "finish" some 4 times by now. Official servers will be wiped sometime in December, possibly with a new patch arriving, but you can always play single player and even invite a friend to play on your local save and never lose progress (unless the save gets corrupted, which can happen).

Caves of Qud has nearly infinite replay value with all the random generations + mods. You can do nearly anything you set your mind to. Same with Project Ozone 3 (Minecraft mod). If you like goal orientated games that are multiplayer try Space Station 13. That shit is nuts, and I mean 13 not the 14 on Steam it doesnt have half of what the old one does. But the launcher is about to go out for 13 so get it while you can.

I found that Two Worlds had a lot of fuck around potential. You can infinitely combine weapons that are duplicates to strengthen them. I once killed every NPC in the entire game and used the resurrection spell on them so everyone was completely loyal to me even monsters.

If you can still find it. There was this online Pokémon game that was somehow realistic. You controlled your character typed ccommands for your Pokémon. And they were always alongside you when out of their ball. It was hardcore as shit. I got my cheeks clapped multiple tines trying to run to a different village by gangs of mankeys and caterpies. Nintendo is just drooling on the floor not doing this officially. It took forever to level, it was an extreme challenge to find stuff to evolve your Pokémon. Ugh I hope thats still out there somewhere.

A less spoken one nowadays that is also very fun is still the original Morrowind. Absolutely mind blowing how expansive that game is to this day. It is still just as legendary as it was back then even if it is a little dated. I actually come to like it when a game isn't guiding me on what to do in an RPG. It feels more immersive when I'm supposed to know what a Guar looks like.

Team Fortress 2. There's just so many different ways to play the game with its combination of classes, weapons and game modes!

The Binding of Isaac