RCS requirements can be found in Chapter 9 of the Section 8 Renewal Policy Guidebook.
If your renewal option requires an RCS, then it will be adjusted each year by the OCAF factor. They life of an RCS is 5 years. After 5 years you will be required to have a HUD approved appraiser conduct another study and submit it to AHSC for approval.
Click on the following link Section 8 Renewal Policy Guidebook