Others have covered the topic of modern renders and their shortcuts but if you wanted an exact replica I think films like this are rendered on large HPC clusters.

Looking at the Top500 stats for HPCs the average top500 cluster in 1995 was 1.1TFlops, and today that seems to be around 23.4PFlops.

An increase of approximate 21,000 times.

So 800,000 hours from 1995 is about 37 hours on today’s average top500 cluster.