25 C.F.R. § 224.78
How long will a TERA remain in effect?
A TERA that takes effect under this part remains in effect to the extent any provision of the TERA is consistent with applicable Federal law (including regulations), unless and until either:
(a) The Secretary reassumes all activities included within a TERA without the consent of the Tribe under Subpart G; or
(b) The Tribe rescinds a TERA under Subpart H.