I bought an item in some ebay store. Seller accepted payment and then later sent an email that the item is no longer in stock, asking if I would like another item in his store.

I replied that I did not and that I would like my money back.

How long should I at most wait before talking to ebay or paypal?
Thus far, I've given the seller 2 days to react to my mail (I'm in Denmark, he's in Asia).