on 08-02-2013 10:59 PM
Preferably straight away.
If you can not pay then do not bid or buy.
But ebay allow 8 days to pay before a seller can open and close a non payer dispute.
A dispute can be opened 4 days after the sale and if no payment is made 4 days later the dispute can be closed and the buyer gets a non payer strike.
But every seller has their own terms so you need to ask a seller if it is not mentioned in their listing how long they will give you to pay.