I don't think it's for everyone, but I've played https://store.steampowered.com/app/646570/Slay_the_Spire/ for about 600 hours at this point. It's a roguelike deckbuilder -- you build a deck of cards and work your way through a randomly generated map, constantly trying to get stronger at a faster rate than the enemies you'll face, by picking up new cards, relics that give you certain bonuses, and also by removing your starter cards that aren't very good compared to ones you pick up later.
It's a difficult game, especially if you start going up in difficulty ("ascension"), but very rewarding. If it's for you, it's a game you can play basically forever.
A single run takes 1-1.5 hours once you're used to it (rarely more than 70 mins for me), maybe closer to 2 hours when you're a few days in. The game saves at every floor, about 50 times per run, so it's easy to quit and come back.
I should point out that I had a strong aversion to any kind of game involving cards, yet ended up falling in love with StS to the point that it might be my second most played game of all time just three years later.