The video author (Sammyuri) clarified it in a comment: > This build does NOT run in real time. It runs on MCHPRS, the server developed by StackDoubleFlow, whic

The video author (Sammyuri) clarified it in a comment: > This build does NOT run in real time. It runs on MCHPRS, the server developed by StackDoubleFlow, which speeds up the game roughly 10-20,000x while running redstone. That brings the framerate to a much more reasonable 0.1fps, so the long timelapses in the video only took 9 hours to record in total.