Actually saved me coming back from work.
"Sniper protection: optional. When bidding gets fast paced and heated toward the end of the auction, sniper protection will extend the auction by a set time after the last bid. For example, if there are 2 minutes left in the auction, with a 1-hour sniper protection, and someone places a new high bid, the auction is extended by 1 hour. If another bid comes in after that, the auction is extended again by 1 hour from the time of the bid, and so on, until there are no more bids within an hour of the last one. The sniper protection time frame may be set to any number, though should be kept reasonable. "