Expiration. A special permit shall lapse 24 months, which shall not include such time required to pursue or await the determination of an appeal referred to in MGL c. 40A, §
17, from the grant thereof (the date of filing the special permit approval with the Town Clerk), if a substantial use thereof has not sooner commenced except for good cause or, in the case of a permit for construction, if construction has not begun by such date except for good cause.