; and (B) the contractor shall immediately comply with the order issued under subparagraph (A) or shall otherwise be in violation of section 6502(5). (2) Orders An order issued under paragraph (1) shall— (A) be effective at the time at which the order is served upon the contractor, which may be accomplished by the posting of a copy of the order in a conspicuous location at the place of business of the contractor; and (B) remain in effect during any review conducted under paragraph (3) and during any hearing and appeal of such order under paragraph (4). (3) Review for reconsideration (A) In general A contractor against whom an order is issued under paragraph (1) may request a review by the Secretary to contest the order. (B) Requests A request under subparagraph (A) shall be made in writing to the Secretary not more than 5 days after the issuance of the order. (C) Requirements for review (i) In general A review under this paragraph shall— (I) commence not later than 24 hours after a request is made under subparagraph (B); and (II) conclude not later than 24 hours after such commencement. (ii) Determination Not later than 72 hours after a review concludes under clause (i)(II), the Secretary shall determine whether to affirm, modify, or revoke the contested order. (4) Hearings and appeals Any person aggrieved by a determination of the Secretary under paragraph (3)(C)(ii) may— (A) request a hearing to appeal such determination to an administrative law judge