Is there a limit to how many referral vouchers I can earn? November 13, 2018 20:27 Updated There is no limit to the amount of vouchers you can earn and apply to a future reservation. Related articles How does the referral program work? How will I receive my credit for a referring another customer? Can I earn a referral voucher for friends or family that are going on the same cruise with me? When will my Onboard Credit be applied to my account? What forms of payment are accepted?