Is there a limit to how many referral vouchers I can earn? December 19, 2018 13:46 Updated There is no limit to the amount of vouchers you can earn and apply to a future reservation. Related articles 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? How does the referral program work? Should I purchase a beverage package from the cruise line?