34 C.F.R. § 98.9
(c) If the Office finds that the recipient or contractor has not complied with section 439 of the Act, the Office includes in its notice under paragraph (b) of this section:
(2) Provides a reasonable period of time, given all of the circumstances of the case, during which the recipient or contractor may comply voluntarily.
(Authority: 20 U.S.C. 1221e-3(a)(1), 1232h)