43 C.F.R. § 4.817
A notice of opportunity to request a hearing shall set a date not less than 20 days from service of said notice within which the applicant or recipient may file a request for a hearing, or may waive a hearing and submit written information and argument for the record, in which case, the applicant or recipient shall have the right to further participate in the proceeding. When the applicant or recipient elects to file a request for a hearing, a time shall be set for the hearing at a date not less than 20 days from the date applicant or recipient is notified of the date set for the hearing. Failure of the applicant or recipient to request a hearing or to appear at the date set shall be deemed a waiver of the right to a hearing, under section 602 of the Act and the regulations thereunder and consent to the making of a decision on such information as is available which may be presented for the record.
43 C.F.R. § 4.817