5 C.F.R. § 2411.10
(a) Authority/General Counsel/Panel/IG.
(1) Whenever any request for records is denied, a written appeal may be filed within thirty (30) days after the requester receives notification that the request has been denied or after the requester receives any records being made available, in the event of partial denial.
(2) The Chairman of the Authority, the Chairman of the Panel or the General Counsel, as appropriate, shall, within twenty (20) working days (excepting Saturdays, Sundays, and legal public holidays) from the time of receipt of the appeal, except as provided in § 2411.11, make a determination on the appeal and respond in writing to the requester, determining whether, or the extent to which, the request shall be granted.