Pratchett Terry. Discworld 26. Thief of Time

Harper Prism, 2001.Everybody wants more time, which is why on Discworld its management is entrusted to the experts: the venerable Monks of History, who store it and pump it from where it's wasted, like underwater (after all, how much time does a codfish really need?) to places like cities, where harried citizens are forever lamenting, "Oh where does the time go?"