If you have seriously something worthwhile to do in life, then time is a friend. But if you are just loafing around and you fully well know that you are just killing time, then obviously time is an enemy. Every passing moment reminds you that you are committing a crime against yourself. The clock, the tick-tock is actually the announcement of a perpetual sentence, constantly telling you that you are being condemned to an inner hell of total waste.
So it becomes very, very important to just pass away time. Have you seen how people are addicted to TV, to gossip, and to all kinds of methods that just somehow enable them to pass time? Pursuit of happiness is a great way to pass time.