Auto Extend Auto Extend in a feature in the system that automatically extends the normal closing time of an individual auction listing if any bids are received near that listings current closing time. This feature is used to prevent bid sniping. Bid sniping is a technique used by some bidders in order to try and grab an item at the last moment in order to try to keep the current bid as low as possible and lock out any potentially less experienced bidders from being able to place a winning bid on the item. Once Auto Extend is applied to an auction, the auction will not end until there are 10 minutes with no bids.