If you are thinking about summer, June, July and August which is peak time, it will be very difficult. Even Marriott owners trying to exchange in have trouble during the peak summer months. My sister is a Marriott owner and had a request going for about 9 months and finally gave up and decided to go somewhere else. She didn't want to be left within a summer beach vacation. I did receive an exchange using a Marriott BeachPlace week, received it about 13-months out. If a Marriott owner has 2 or more weeks than they can reserve and deposit 13-months out. I felt very lucky to receive my week very early. OceanWatch is a very nice resort, we use to own there. If you wanted to go during off-season then you shouldn't have much trouble getting an exchange.