Can't think of a game that's actually like this. Not even one.
If a game isn't vibing with you after the first 10-20 hours, you're forcing yourself to play it. Nothing says you HAVE to play it, either. At least with reference to longer games.
For shorter games that are around 30-60 hours to complete I'd say if the intro doesn't compel you to keep going, it is fair to drop it (so 3-4 hours at most maybe).
Again, if you don't like a game, nobody is forcing you to play it. And playing it longer is not going to suddenly make it better. LITERALLY NO GAME gets "better" half way to three quarters of the way through.
Even MMOs.