When a refund is given it depends if the money was in the paypal account or the payment was taken from a bank card in the paypal account.
If for example you paid by a bank card the money will take up to 7 days and will be returned to the bank account it came from.
If for example you paid by the paypal balance the money will return and show in your paypal balance on screen. This can also take 7 days but normally quicker.
If that makes sense.