Incidental variances and all rights conferred
by the grant of such variances shall expire unless a building permit
is obtained and construction of the project is begun within six months
of the date when the applicable period of protection from zoning changes
provided by N.J.S.A. 40:55D-46.1, 40:55D-47, 40:55D-49 and 40:55D-52
plus all mandatory and/or discretionary extensions of minor subdivision
approval, preliminary and final major subdivision approval or preliminary
and final site plan approval, as the case may be, has expired.