Shooters aren't known for having too many cutscenes, at least not when compared to RPGs or, you know, Metal Gear Solid. Sony's Killzone 3 is pushing that stereotype, however.
The BBFC (British Board of Film Classification) website has the game's cutscene time pegged at 70 whole minutes, or an hour and ten minutes. Sure, we've seen games with more, but that's a big leap from Killzone 2, which had only 25 minutes in cutscenes. Between the second and third game, that's a 45-minute difference.
Can't imagine the characters having that much to say in Killzone 3, but you never know.