I apologize for the late response. The answer is - the certificate you are referring to is a Confirmable Room Upgrade Certificate. It is good for one continuous stay, defined as the total number of consecutive nights spent at any one participating hotel. However, the Paid Towers Upgrade Certificates are a little different. You need to have one Certificate per night when redeeming. At the Waldorf Astoria and Fontainebleau two Certificates per night are required. I apolgize for the incorrect information. Let me know if you need further assistance.