If you guys read carefully.. I think the first item that expires is a time gauge, and a hint to remove all the other auctions.
For example, put the auctions up at 3am with 5 seconds interval.
2 hours later when the first auction expires and disappears from the screen, cancel the auctions in 5 seconds intervcal.
I don't know whether it work this way, I will get home to give it a try. Thanks alot!