In the case of a subdivision of, or site plan for, an area of 50 acres or more, the Planning Board may grant the rights referred to in Subsection G(1)(a), (b) and (c) of this section for a reasonable period of greater than three years, but not more than seven years. The developer may apply for thereafter, and the Planning Board may thereafter grant, an extension of the preliminary approval for not more than three additional one-year periods, provided that if the design standards have been revised by ordinance, such revised standards may govern. The granting of this extended approval period shall be based upon the Planning Board's consideration of such factors as:
(a)
The total number of dwelling units and/or square footage of nonresidential floor area proposed;
(c)
The comprehensiveness of the development.