Here is ebay policy regarding timing of retractions. The way I am reading paragraph 3 is that if they placed their bid less than 12 hours they can retract within an hour....so if they placed the bid 5 minutes before auction ending, then can retract anytime before the auction ends? Am I right???
There are special rules about retracting bids, depending on when you originally placed the bid.
1) If you place a bid before the last 12-hours of the listing: You may retract that bid before that last 12-hours, if your situation meets the above description of exceptional circumstances. You will not be allowed to retract that bid during the last 12-hours of the listing.
2) When you retract a bid before the last 12 hours of a listing: you will eliminate all bids you have placed on that item. If you are correcting a bidding error, you will have to bid again.
3) If you place a bid during the last 12-hours of the listing: You may retract the bid only within one hour after placing the bid (and if your situation meets eBay's exceptional circumstances description).
4) When you retract a bid within the last 12 hours of the listing: You will eliminate only the most recent bid you placed. Bids you placed prior to the last 12 hours will not be retracted.
5) If you are not allowed to retract your bid during the last 12-hours of the listing, you may contact the seller to request that your bid be canceled. The seller will have the discretion whether to cancel your bid.