https://www.pcgamer.com/this-nightmarish-rollercoaster-tycoon-track-takes-12-real-years-to-complete/

If Hell actually exists, then surely it is this RollerCoaster Tycoon 2 track that takes 12 real-time years to complete before you can get off. Designed by mad-scientist YouTuber Marcel Vos, this roller coaster is an impressive feat of engineering that pushes the 17-year-old game to its absolute limits.

The previous record, also held by Vos, was a roller coaster that took a mere 232 real days to complete. But using some clever tricks and a lot of track, Vos was able to smash that record by a factor of 18. It's worth watching the video in full to get a complete breakdown of how this roller coaster works, but the gist of it is that Vos combines several different features to artificially prolong the time it takes for a car to make a single circuit. The big coaster you see in the video isn't actually the one that sets the record. Instead, it's the tiny coaster tucked into the corner that takes 12 years of real time (or 30 million in-game days) to make a single lap.