43 CFR § 2.16
What is the basic time limit for responding to a request?
June 11, 2020
(a) Ordinarily, the bureau has 20 workdays (including the date of receipt) to determine whether to comply with a request, but unusual circumstances may allow the bureau to take longer than 20 workdays (see §2.19 of this subpart).
(b) A consultation or referral under §2.13 of this part does not restart the statutory time limit for responding to a request.
[77 FR 76902, Dec. 31, 2012, as amended at 81 FR 11128, Mar. 3, 2016]