The amount of hour's played doesn't alas to how much fun you've had, Bannerlord in particular is a very grindy rinse and repeat game, count in amount of time you're moving from point A to point B, in-game loading times and how long it takes to actually progress.
But I get where you're coming from and with most cases you're right, however this sort of game in it's genre, and most strategy games in it's sense you will need to put in a hefty amount of hours to even truly explore the whole grand scope of the game and it's content, once they have though, that's when most peoples disappointment kick's when a game such as bannerlord is severely lacking in working features or features at all.
You can't play 20 hour's of bannerlord and decide, yeah i've explored everything this game has to offer and I no longer like it. For a grand sandbox game those are baby numbers.