Yusuf: Brain function in the dream will be about twenty times more. Now when you enter a dream within that dream, the effect is compounded. That's three dreams, that's ten hours...
Eames: I'm sorry, Maths was never my strong subject. How much time is that...?
Dom Cobb: That's a week the first level down, six months the second level down, third level...
Ariadne: It's ten years...! Who'd wanna be stuck in a dream for ten years...?
Yusuf: [smiling] Depends on the dream...
Inception #1