Off of what I have record of - Stardew Valley. 387 hours on Steam, just over 200 hours on my Switch, and my current file on my phone is at 87 hours - not including previous files that I do not have anymore.
That being said, there are games that I bet would be up there as well but they don’t record time so I have no way of knowing.
Minecraft, which has over 200 hours on my Switch alone despite most of my play time being on PC or my phone.
Starcraft: Brood War Super Smash Bro. Melee. I don’t play these two much, anymore, but when I was young and didn’t have much else of a life, these took up an incredible amount of my time.
Killer Instinct, arcade and SNES Killer Instinct 2 (arcade) which was kind of ported as Killer Instinct Gold (N64)
Those are my top tier without a doubt.
Bloody Roar : Primal Fury was absolutely excellent as well.