This type of game is meant to be played multiple times through on higher difficulty and trying to get the highest score possibles. That time it tells you at the end also doesn't include the amount of times you retry as you died. the game also has a load of VR missions to do and more coming (which might already be out and be free but don't quote me on those).
A lot of people in these comments seem to be missing these points
@icemael: yup, and to be precise, DMC 1 can be comfortably finished in around 2 hours on your first playthrough ( and skipping all the scenes), and that was the meatiest action game of its time content wise.
and this genre, character action if you will, is all about the replays. you shouldn't really bother with any game in this genre if you're just playing a game once and never touch it again. that's just not how they're made.
Granted, it's been a while since I've finished DMC1 but it definitely took me a lot longer than 2 hours (even without cutscenes). The numerous boss fights alone are longer than that.
I don't know about 1 but 3 can be cleared in 3-4 hours
People need to realize how that timer works and that action games are never that long if they are doing their job right. God of War 1, DMC1, Vanquish, viewtiful Joe, Gears of War and DMC3 can all be cleared in just a few hours somewhere around 6 hours is the average. Did you see how long it took for Brad to clear missions in DMC1? Some took him 4 minutes.
These games aren't meant to be these 40 hour long Assassins Creed games that drag because the devs don't come up with cool things to do, they are meant to be focused, replayable, fun, and exciting. There is nothing wrong with paying full price for a game that delivers rock hard mechanics.