Well it takes Pixar 29 hours to raytrace a single frame, so I would consider this much faster than current methods.
Second, this is apple and oranges. Just look at 'ray tracing' is simple and naive. Pixar uses their own renderer, PRman, which has been developed over multiple decades. There is a big difference in renders for film, including micropolygons, texture filtering, more textures, higher res textures, way fewer lighting cheats, much more customization, motion blur, depth of field, sub surface scattering, multi-layered glossy surfaces that are neither fully specular or diffuse, better area lighting models, etc.
https://www.fxguide.com/featured/rendermans-visuals-for-coco...
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.
But not all scenes have the same number of lights and elements.
It won't take 29h to render the title screen for example.