No employer engaged in the operation of a hospital shall be deemed to have violated § 31-76c if, pursuant to an agreement or understanding arrived at between the employer and the employee before performance of the work, a work period of fourteen consecutive days is accepted in lieu of the workweek of seven consecutive days for purposes of overtime computation and if, for his employment in excess of eight hours in any workday and in excess of eighty hours in such fourteen-day period, the employee receives compensation at a rate not less than one and one-half times the regular rate at which he is employed.