N.J. Stat. Ann. § 18A:64A-25.26

All specifications for the doing of any such construction work for a county college shall fix the date before which the work shall be completed, or the number of working days to be allowed for its completion, and every such contract shall contain a provision for a deduction from the contract price for any moneys paid by the county college to any inspector or inspectors necessarily employed by it on the work for any number of days in excess of the number allowed in the specifications.