If a bid that changes the maximum offer amount, including a proxy bid, is placed during the final five (5) minutes of an auction, its end time will automatically extend for 5 additional minutes. This will continue until no bids are placed within the last five minutes of the auction.

This is much like a live auction: When the auctioneer is concluding the sale of an item, a person might make a bid at the last moment. The auctioneer then asks if anyone else would like to make a higher bid, essentially extending the auction until everyone has had a chance to make their final bid on the item.

Most online auctions are bid on during the final minutes. This option allows everyone a fair chance to bid until no more bids are placed.