25 C.F.R. § 224.74
When must the Secretary approve or disapprove a final proposed TERA?
The Secretary must approve or disapprove a final proposed TERA within 270 days of the Secretary's receipt of a complete application for a TERA. If the Secretary fails to approve or disapprove a final proposed TERA within 270 days, the TERA takes effect on the 271st day after the Secretary's receipt of a complete application from a qualified Tribe.