[nexensis]

It takes 29 hours for a single CPU core (or thread?) to render one frame, which is reasonable for Pixar-quality scenes.

Big Hero 6 was rendered using 55,000 CPU cores in parallel, which would bring the final render time closer to 70 hours for 144k frames (assuming maximum efficiency and ignoring all the tests and overhead).

For reference you can download a production benchmark scene (https://www.blender.org/download/demo-files/) from the Blender team's short film and try to render it at 1080p — my 16-thread Ryzen CPU takes over an hour to finish one frame.

Also feature films are rendered in 4K or above which quadruples the render time over 1080p.