The amount of time required to process the refund relies on the method of payment that was used to purchase the ticket.
If the passenger purchased the ticket with a credit card, the refund would be shown on one of the next two credit card statements after requesting a refund. The time will depend on the billing cycle of your credit card company.
If the passenger purchased the ticket with cash or check: he will receive the processed refund within 20 days after Copa Airlines Reservations gets the customer’s refund request.