46 C.F.R. § 201.172 Time for filing petition to reopen.
Title 46 - Shipping
Except for good cause shown, and upon leave granted, petition to reopen under §201.174, shall be filed with the Administration within twenty (20) days after the date of service of the Administration's decision or order in the proceeding, unless a different period is fixed under §201.54.
Title 46: Shipping
PART 201—RULES OF PRACTICE AND PROCEDURE
Subpart R—Stay of Administration's Decision, Reopening of Proceedings (Rule 18)
§ 201.172 Time for filing petition to reopen.