For the purpose of this section, a final plat shall include all land divisions subject to this title. A final plat may be presented to the Administrator at any time after preliminary approval and prior to expiration. The final plat shall be accompanied by one copy. The final plat shall be approved, disapproved or returned to the applicant within thirty (30) days from the date of submission to the County unless the applicant consents in writing to an extension of such time period.