Albert Camus, The Plague

Query: How contrive not to waste one’s time?
Answer: By being fully aware of it all the while.
Ways in which this can be done: By spending one’s days on an uneasy chair in a dentist’s waiting-room; by remaining on one’s balcony all a Sunday afternoon; by listening to lectures in a language one doesn’t know; by traveling by the longest and least-convenient train routes, and of course standing all the way; by lining up at the box-office of theaters and then not buying a seat; and so forth.”