in last sentence of this paragraph:

rrt="" Recurring Times (i.e., a fixed number of installments). Only valid w/ Membership Level Access. When unspecified, any recurring charges will remain ongoing until cancelled, or until payments start failing. If this is set to 1 or higher the regular recurring charges will only continue for X billing cycles, depending on what you specify. This is only valid when rr="1" for recurring "Subscriptions". Please note that a fixed number of installments, also means a fixed period of access. If a Customer's billing is monthly, and you set rrt="3", billing will continue for only 3 monthly installments. After that, billing would stop, and their access to the site would be revoked as well (based on your EOT Behavior setting under: s2Member → PayPal Options). IMPORTANT NOTE: If you don't offer a trial period; i.e., the first charge occurs when a customer completes checkout, you should set this to the number of additional payments, and NOT to the total number. For instance, if I want to charge the customer a total of 3 times, and one of those charges occurs when they complete checkout, I set should this to rrt="2" for a grand total of three all together.