On one hand, Naughty Dog had to rebuild the thing from scratch to get the visuals and animations up to 2022 standards - one developer called it "the most meticulously built and crafted project" he'd ever worked on - but it's also worth considering that the developers already had a thorough blueprint going in with the original game, so presumably it required less work overall than a brand new game of a similar scope might demand.
After scoring a degree in English from ASU, I worked as a copy editor while freelancing for places like SFX Magazine, Screen Rant, Game Revolution, and MMORPG on the side.