45 CFR § 2105.59
When can you expect a decision on your appeal?
April 14, 2021
(a) The basic time limit for responding to an appeal is 20 workdays after receipt of an appeal meeting the requirements of §2105.56.
(b) If the Agency is unable to reach a decision on your appeal within the given time limit for response, the appropriate deciding official for FOIA appeals will notify you of your statutory right to seek review in a United States District Court.