I don't have an exact number but it would have to be at least 5000 hours I've sunk into Minecraft. Been on and off the game since 2013, I'd get bored of the current version and switch to Beta (fairly sizable community on r/goldenageminecraft), I'd do some worlds where I'd obtain stuff in older versions that weren't obtainable later (whole wiki on Discontinued Minecraft items/blocks/structures/entities), of course I'd do modded.
I think the thing with Minecraft for me is that I spent all the time learning the game back in high school when I had more free time than I do as an adult, and I can nowadays play it extremely casually (~3 hours/week).
Its hard for me to get into new games (most recent game I got was Dredge) because I have like 2 hours a session to learn it, and it might be a few days between sessions.
I feel you man. It's few and far between where there's a game you can easily drop / pick up on a whim with limited time. The only one that comes to mind would be Powerwash Sim but Infully realize that's not for everyone. Wish I wasn't so exhausted I'd go try to pull a list for you. Maybe Cult of the Lamb? Anyway, hardcore Minecraft fan myself. Consider it one of my fave zen games. Enjoy man! Merry Christmas!