I think it just depends on whether you feel like the game is respecting your time or not.
A long game that's eating up time with boring random encounters, fetch quests, grinding that you don't enjoy, and so on? Ain't got time for that, I'll play something else.
But a long game where I'm enjoying near every minute and every aspect, like an RPG that's been crafted absurdly well and isn't filled with bloat and has fun combat in every encounter? I'm all in for that.
I think the issue is mainly that for obvious reasons there are FAR more of the former than the latter, even before accounting for personal taste.