41 CFR § 102-5.60
How long are initial determinations effective?
June 9, 2020
Initial determinations are effective for no longer than:
(a) Two years for field work, updated as necessary; and
(b) Fifteen days for other circumstances.
Initial determinations are effective for no longer than:
(a) Two years for field work, updated as necessary; and
(b) Fifteen days for other circumstances.