21 CFR §117.260

1. (a)If you receive an order under § 117.254 to withdraw a qualified facility exemption, you must either:
   1. (1)Comply with applicable requirements of this part within 120 calendar days of the date of receipt of the order, or within a reasonable timeframe, agreed to by FDA, based on a written justification, submitted to FDA, for a timeframe that exceeds 120 calendar days from the date of receipt of the order; or
   2. (2)Appeal the order within 15 calendar days of the date of receipt of the order in accordance with the requirements of § 117.264.
2. (b)Submission of an appeal, including submission of a request for an informal hearing, will not operate to delay or stay any administrative action, including enforcement action by FDA, unless the Commissioner of Food and Drugs, as a matter of discretion, determines that delay or a stay is in the public interest.
3. (c)If you appeal the order, and FDA confirms the order:
   1. (1)You must comply with applicable requirements of this part within 120 calendar days of the date of receipt of the order, or within a reasonable timeframe, agreed to by FDA, based on a written justification, submitted to FDA, for a timeframe that exceeds 120 calendar days from the date of receipt of the order; and
   2. (2)You are no longer subject to the modified requirements in § 117.201.