Unless the request for retrocession is rescinded, the retrocession becomes effective within the timeframe specified by the parties in the compact or funding agreement. In the absence of a specification, the retrocession becomes effective on:

(a) The earlier of 1 year after:

(1) The date of submission of the request, or

(2) The date on which the funding agreement expires; or

(b) Whatever date is mutually agreed upon by the Secretary and the retroceding Self-Governance Tribe.