5 C.F.R. § 1302.4
(b) Procedures.
(2) OMB action on the request. To the extent possible, a decision upon a request to amend a record will be made within 10 days, excluding Saturdays, Sundays, and legal Federal holidays. The response reflecting the decision upon a request for amendment will include the following:
(vi) A description of any other procedures which may be required of the individual in order to process the appeal.
If the nature of the request or the system of records precludes a decision within 10 days, the individual making the request will be informed within 10 days of the expected date for a decision. Such a decision will be issued as soon as it is reasonably possible, normally within 30 days from the receipt of the request (excluding Saturdays, Sundays, and legal Federal holidays) unless unusual circumstances preclude completing action within that time. If the expected completion date for the decision indicated cannot be met, the individual will be advised of that delay and of a revised date when the decision may be expected to be completed.