The planned development shall be developed in accordance with the general development plan approved by the Planning Board notwithstanding any provision of the Municipal Land Use Law (N.J.S.A. 40:55D-1 et seq.), or of any ordinance or regulation adopted pursuant thereto after the effective date of the approval.

The term of the effect of the general development plan approval shall be determined by the Planning Board using the guidelines set forth in Subsection C of this section, except that the term of the effect of the approval shall not exceed 20 years from the date upon which the developer received final approval of the first section of the planned development.

In making its determination regarding the duration of the effect of approval of the general development plan, the Planning Board shall consider: the number of dwelling units or amount of nonresidential floor area to be constructed; prevailing economic conditions; the timing schedule to be followed in completing the development and the likelihood of its fulfillment; the developer's capability of completing the proposed development; and the contents of the general development plan and any conditions which the Planning Board attaches to the approval thereof.