Thief Of Time

Time is a resource. Everyone knows it has to be managed. You mess with it at your peril. You can let it move fast or slowly but what you mustn't do is allow it to stop.

The Monks of History have the glamorous job of time management in the Discworld. They store it and pump it from the places where it's wasted (like the underwater - how much time does a codfish need?) to places like cities, where there's never enough time.