A Woot-Off is a continuous sale of Woot items. When one sells out the next item is posted immediately. In the rare event that a particular item lasts more than 12 hours, the sale will advance to the next item.
Woot-Offs are currently held every two months, usually beginning on the Wednesday or Thursday of the second or third week of the month. A Woot-Off lasts 24-72 hours.