In the Blend file, I don’t remember how the samples were set. I realized during my work that I can animate the samples number. But before that I just rendered parts of the animation with different samples. I’m not so sure to remember but for the exterior shots, 200 samples were more than enough, inside with the big blur, 700 samples were not enough but i used it because of the time (around 20min/frame), and the fact that to realy get rid of the noise I needed more than 9000 samples.
I use a i7 with 6 cores with two gtx 580. So during day time only one gtx580 was calculating. And at night both of them.