19 C.F.R. § 171.22

A decision to mitigate a penalty or to remit a forfeiture upon condition that a stated amount is paid will be effective for not more than 60 days from the date of notice to the petitioner of such decision unless the decision itself prescribes a different effective period. If payment of the stated amount or arrangements for such payment are not made, or a supplemental petition is not filed in accordance with regulation, the full penalty or claim for forfeiture will be deemed applicable and will be enforced by promptly referring the matter, after required collection action, if appropriate, to the appropriate Office of the Chief Counsel for preparation for referral to the Department of Justice unless other action has been directed by the Commissioner of Customs.