The 15 Minute Rule allows bidders to continue to bid, after the closing of the auction on lots they were bidding on prior to the auction closing time.
Bidders who have placed bids on specific lots can continue to bid on those lots in 15 Minute increments until there are NO BIDS on ANY LOT for a 15 Minute Period. The auction will stay open as long as ANY bids are being placed. The 15 Minute Rule will stay in effect until there are NO BIDS on ANY LOTS for a 15 Minute period.
Happy Bidding & Good Luck!