The Planning Board, when acting as a Board of Adjustment, shall render a decision not later than 120 days after the date an appeal is taken from the decision of an administrative officer or the submission of a complete application for development to the Planning Board. Notwithstanding the above, where separate and subsequent applications are filed pursuant to § 28-4.4b.7(b) above, the time for determining the separate variance application shall be 120 days, and the time for approval of the subsequent application shall be the normal time provided therefore pursuant to the applicable provisions of this chapter.