Your customers can activate each individual vacation certificate one time within a 24 month period. This means your customer can each take advantage of a smartwatch, a tablet, a 2 night hotel stay, a 7 night resort stay, etc., enjoying each individual incentive within a 24 month period. However, your customer cannot redeem two of the same type of certificates within the span of 24 months. It's one certificate type per person per 24 months.