Originally Posted by shiznit

There is a guide on Deltanet that describes it.

Essentially you can buy 12N (Supp. Vac. Days) through the full service bank option 3 in DBMS.

You buy per day at 3:15 each, with a max of 10 days purchased.

If you buy after the primary vacation bid is open, they will be added to the end of your most recently awarded week when you made the request.

If you buy after March bid period starts but before April 1, then you can have them placed at the beginning or end of any week you have bid.

If you buy after April 1, they can only be placed if there is an available week adjacent to the weeks you have been awarded.