Exchange your Overlay Points through Interval International! (fee applicable) We recommend this option if you know that you would like to stay at least one (1) week at a Marriott Vacation Club or Interval International resort. If you choose this option, you will have two (2) years from the time you exchange to use your one (1) week stay. Please note, you must have a valid Interval International membership in order to exchange your Overlay Points. Should you like to exchange your Overlay Points, you must advise us at least 60 days prior to expiration.