Actually, since they produced a movie in a year, i think the actual rendering of it took less than that.
Don't forget about render farms.
According to Pixar's site, for Monster's Inc:
Each frame (at 24 fps) took around 6 hours to render, though some frames took up to 90 hours
However, they have hundreds (maybe thousands?) of computers rendering at least that many frames at a time.
So let's say they have 500 computers, and their estimate of an average of 6 hours per frame is usable:
Every 24 hours(1 day) 12,000 frames could be produced
12,000 frames @ 24 fps equals 500 seconds = 8 1/3 minutes per day
Monsters Inc. is 116 Minutes
at this rate, the full movie could be rendered in 13.92 days... about 2 weeks
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