It really depends on the genre you're looking at most of the time. RPGs, even action rpgs, tend to be quite long and have been for a very time but you'll usually find games in the FPS genre where the campaign is under ten hours long.
In terms of actual game length, games that are over twenty hours long are generally my preference since games in Canada are roughly $70-$80 now before taxes are tacked on so if I'm being expected to pay that much then I don't want a game I'll finish in under a day if I really get into it.
On the other hand, much like sumanoskae the actual length of the game sometimes has nothing to do with how long it takes me to finish. I've actually lost my interest in many open-world games due to how many of them fill the map with meaningless side-objectives or lack story direction. I think The Witcher 3 is actually one of my more ideal open-world games since they limit their filler and what filler is there is generally pretty interesting.
In terms of actual game length, games that are over twenty hours long are generally my preference since games in Canada are roughly $70-$80 now before taxes are tacked on so if I'm being expected to pay that much then I don't want a game I'll finish in under a day if I really get into it.
On the other hand, much like sumanoskae the actual length of the game sometimes has nothing to do with how long it takes me to finish. I've actually lost my interest in many open-world games due to how many of them fill the map with meaningless side-objectives or lack story direction. I think The Witcher 3 is actually one of my more ideal open-world games since they limit their filler and what filler is there is generally pretty interesting.