L.A. Noire contains 50 hours of dialogue
According to Team Bondi's Brendan McNamara, L.A. Noire will feature more than two full days of dialogue. Presumably it also features subtitles and a skip button, or there goes half the audience.
"We captured over 50 hours worth of dialogue in total, all using MotionScan -- it's equivalent to about two full seasons of a TV show," McNamara told IGN.
Thankfully, it seems you won't be sitting through an identical fifty hours of waffling every time you want to explore 1947 Los Angeles.
"Each case has its own twists and turns depending on the choices you make, leading you down different paths on your way to cracking the case, giving you plenty of reasons to jump back in and replay the game."