Hi TodoPapel.
You can let your buyers know that it typically takes 2 to 5 business days for the refund to be reflected in their bank account or card statement.
It sounds like you already have but, to refund a buyer's credit card payment, click Your Shop > Sold Orders. Click to view the receipt, then select Manage Order > Issue a refund. You can issue either a partial or full refund.
Once you issue the refund, Etsy will send you and the buyer a notification email.
Hope that helps. Enjoy your weekend!