Leisure

Three criteria make an experience leisure:

1. The experience is a state of mind.
2. It must be entered into voluntarily.
3. It must be intrinsically motivating of its own merit.

If you're looking for some easy, not-really-quality leisure you can just spend time playing online. You'll most certainly find something addictive. See the 'Top 10 Free Time Wasting Sites' @ http://freebies.about.com/od/710/tp/timewasting.htm

But if you're serious about your time...

Alea Iacta Est

Or 'The die has been cast'.
When the bets are closed, and the game is on. When the point of no returned has been reached. When the inevitable will happen. That's when alea iacta est

It's when there's nothing to be done and when all you can do is watch. It's out of your hands and it's too late for changes - because alea iacta est.

When crossing the Rubicon.