Length of awards
ADP is awarded without a fixed end date. When making an award, SSS can (but does not always) specify a period after which it will review your ADP award, if it thinks that your needs are likely to change. The length of any review period should be based on whether, and how soon, your needs are likely to change. If you get the enhanced rate of both ADP components and your needs are unlikely to change (or only unlikely to increase) you should not be set a review period. If a review period is set, SSS must make a new determination of your entitlement after that period ends (see here).1Regs 37 and 47 DAWAP(S) Regs; SSS, Decision Making Guide: choosing an appropriate review period for adult disability payment, available at socialsecurity.gov.scot
SSS can reduce or stop the award earlier if it has grounds to (see here).
 
1     Regs 37 and 47 DAWAP(S) Regs; SSS, Decision Making Guide: choosing an appropriate review period for adult disability payment, available at socialsecurity.gov.scot »