Might be Ark: Survival Evolved. Steam says I have 1007 hours logged but that's way off because I AFKed and left the game running a lot. Still I must have been playing it for at least 500 hours.
I've played Zelda OoT a lot too. I lost count of how many times I replayed that game, so I might very well have played it more than Ark. But that's over the course of most of my life. Ark I've only been playing for a couple years or so, and only over a few weeks at a time before taking a long break.
I never get so hooked on a game that I can play it all day every day for weeks, but that's what happened with Ark, and Zelda BotW. I usually don't tend to go for the kind of games you can play forever anyway. I like games with a beginning and an end. I guess Ark technically does have an endgame now after they went out of EA, but it's not much to speak of.