Quote:

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A Scanner Darkly was filmed digitally and then animated with Rotoshop, a proprietary graphics editing program created by Bob Sabiston. Rotoshop uses an animation technique called interpolated rotoscope, which was previously used in Linklater's film Waking Life. Linklater discussed the ideas and inspiration behind his use of rotoscoping in a UK documentary about him in 2004, linking it to his personal experiences of lucid dreaming. Rotoscoping in traditional cell animation originally involved tracing over film frame-by-frame. This is similar in some respects to the rotoscope style of filmmaker Ralph Bakshi. Rotoscope animation, however, makes use of vector keyframes, and interpolates the in-between frames automatically. Sabiston and his team managed this unprecedented animation pipeline initially, but at the time of his departure, art direction in the studio was still not established and the film's production process was extended well past its initial September 2005 release date target. [2] Each minute of animation required 500 hours of work.[3][\quote]-as found on wikipedia http://en.wikipedia.org/wiki/A_Scanner_Darkly_(film)#Animation
under animation

i believe i read it in rollingstone about the animation taking 500 grs for each minute as it also says on wikipedia.