This attribute specifies the amount of time (in minutes) that a cached subject result can be used to evaluate the same policy request based on the single sign-on token.
When a policy is initially evaluated for an SSO token, the subject instances in the policy are evaluated to determine whether the policy is applicable to a given user. The subject result, which is keyed by the SSO token ID, is cached in the policy. If another evaluation occurs for the same policy for the same SSO token ID within the time specified in the Subject Result Time To Live attribute, the policy framework retrieves the cached subjects result, instead of evaluating the subject instances. This significantly reduces the time for policy evaluation.