36 C.F.R. § 51.10 How long will I have to submit my proposal?
Title 36 - Parks, Forests, and Public Property
The Director will allow an appropriate period for submission of proposals that is not less than 60 days unless the Director determines that a shorter time is appropriate in the circumstances of a particular solicitation. Proposals that are not timely submitted will not be considered by the Director.
Title 36: Parks, Forests, and Public Property
PART 51—CONCESSION CONTRACTS
Subpart C—Solicitation, Selection and Award Procedures
§ 51.10 How long will I have to submit my proposal?

