A minimum thirty-minute meal period must be provided in each shift exceeding five hours when there are two or more employees on duty. Employees may waive their right to a meal period upon agreement with the employer. Employees do not have to be paid for meal periods if they are completely relieved of their duties and the meal period is ordinarily thirty minutes in length. The employee is not completely relieved if required to perform any duties during the meal period. Collectively bargained agreements will prevail over this provision.