You have 60 days. Don't wait get it done as soon as possible. Go to the SS disability site and find out exactly what forms you need. Make sure you give them the names of all your doctors. No matter how insignificant it may seem. There are 5 stages SSI uses to make their decision. If you miss one they sometimes deny you right there. Did they tell you why you were turned down? Sometimes you have to qualify through a different agency.