I know one should give the buyer 7 days to respond, but it is clear that this guy's messing around with bids on bidorbuy and has NO intention of puchasing the items for which he is bidding. IF THIS GUY BIDS ON AN ITEM, DELETE THE BID SO THAT SERIOUS BUYERS CAN BID!
I have tried to contact him 3 times by e-mail, and once by phone, and still haven't gotten hold of him. Don't ever use him as a seller, and delete him if he is a buyer.