It comes in four waves, primary, secondary, tertiary, and whatever the word is for #4. They'll publish the available weeks for the first bid, I think, in January. Some of the other guys will know for sure. Then you'll bid that round. Then a month or so later, they'll do the next round, etc, etc. You can do vacation moves after you've received your vacation bids. I think that's how it works. I just react to the messages on I Crew.