43 CFR § 2.15 - What is multitrack processing and how does it affect your request?
(c) The basic processing tracks are designated as follows:
(1) Simple: requests in this track will take between one to five workdays to process;
(2) Normal: requests in this track will take between six to twenty workdays to process;
(4) Exceptional/Voluminous: requests in this track involve very complex processing challenges, which may include a large number of potentially responsive records, and will take over sixty workdays to process.
(d)Bureaus also have a specific processing track for requests that are granted expedited processing under the standards in § 2.20 of this part. These requests will be processed as soon as practicable.
(e)Bureaus must advise you of the track into which your request falls and, when appropriate, will offer you an opportunity to narrow your request so that it can be placed in a different processing track. If you request placement in a particular processing track but the bureau places you in a different processing track, the bureau will provide you with an explanation of why you were not placed in the processing track you requested.