A certain amount of charitable time is kept back for emergency situations, both small and large. It is parachuted in in times of desperation, and has facilitated peace deals, changed battles, and allowed numerous fathers to make it to the delivery room in time.
The time-sweepers are, by their very nature, a tidy and orderly sort of people. They wish that humans would think more about throwing away this valuable commodity, but don't expect it'll happen any time soon.
There isn't a moral to this story. It's just that if you are planning on throwing away your time, please remember - somebody has to pick it up.