Pete if you are bidding against someone on one of the lots and you make a last bid at 1 minute before the closing time the auction will run a further 5 minutes from the time of your bid so that a chance is given to the other bidder to reply if he wishes to do so, this bidding will continue for 5 mins every time one of you place a bid on your chosen lot until one of you decide to stop bidding. Hope you understand this. This rule only applies to any bids still running over at the closing time set down