This Lamp will turn off in 10 hours...
In this Minecraft redstone video, Mumbo has placed 90,000 redstone repeaters equaling a total delay of 10 hours. He then hooks it up to a lamp, and waits for it to turn off. This video does have some easter eggs for anyone bored enough to watch the entire thing!
Song: C418 - WAIT
Surely you have something better to do than watch this 10 hour video?