Don't wait ! If the seller is not willing to solve any issue you have , then go to the Resolution Center on ebay and open a case .
I buy and sell regularly on Ebay , and the only reason a seller won't cooperate is if he knowingly listed or sold an item that was not as described . This is very rare , but there are always bad apples . I've never had any problems with sellers so I can't say how long the process will take . I have had several problems with buyers and it usually takes 7 to14 days .