Zkuq 21 hours ago
Depends on the game, but I don't remember playing any game where I wouldn't have felt like I was ready to move on after 80 hours. Usually I feel that way much sooner, so that's really more like an upper limit than anything any game should expect to be able to target. As for calendar time, it's probably "some months", depending on the game. For many games, it could probably be much less, maybe less than a month or maybe even less than two weeks.
Sadly it's become very common for games to overstay their welcome. I feel that way quite often, and it's much more rare for me to wish a game was longer.
