Not sure if they will because your handling time is 3 days and you posted on day 4. I would still try though because there is no mention of postage being delayed and it was left within that ridiculous estimate that the buyers take as gospel. RING eBay or get them to call you back. Ask to speak to a supervisor. If you get no luck the first call, try again.

Does this buyer have a habit of leaving negs within 3 days of purchase? Check their feedback left for others.