We are looking into buying a timeshare for Marriott Surf Club that offers biannual (2x per year) usage. Does anyone know if you can use book 2 units for the same week with biannual usage or if the 2 weeks must be at different times during the year? We've asked the sales agent and he said the same week could be booked but he also seemed confused by the questions. Any help sorting this out is much appreciated.