b. Final approval shall be granted or denied within 45 days after submission of a complete application to the administrative officer, or within such further time as may be consented to by the applicant. Failure of the planning board to act within the period prescribed shall constitute final approval and a certificate of the administrative officer as to the failure of the planning board to act shall be issued on request of the applicant, and it shall be sufficient in lieu of the written endorsement or other evidence of approval, herein required, and shall be so accepted by the county recording officer for purposes of filing subdivision plats. Whenever review or approval of the application by the county planning board is required by section 5 of P.L. 1968, c. 285 (C. 40:27-6.3), in the case of a subdivision, or section 8 of P.L. 1968, c. 285 (C. 40:27-6.6), in the case of a site plan, the municipal planning board shall condition any approval that it grants upon timely receipt of a favorable report on the application by the county planning board or approval by the county planning board by its failure to report thereon within the required time period.