Time extension is a practice of some online auctions, where the auction is automatically extended by X minutes if someone bids within the X last minutes. This duration depends on the auction house / bidding platform (see our page about comic art auction houses characteristics). Time extension is mainly used to avoid auction sniping and reproduces what happens on real live auctions where the auctioneer will wait some time after every new bid, prior to announcing the winning bid ("Going once, going twice, sold!").