The requirement of section 7 as to maximum hours which an employee may work without receiving extra pay for overtime is: "no employer shall employ any of his employees who is engaged in commerce or in the production of goods for commerce for a workweek longer than forty hours, unless such employee receives compensation for his employment in excess of the hours above specified at a rate not less than one and one-half times the regular rate at which he is employed."
"Any order, regulation, or interpretation of the Administrator of the Wage and Hour Division or of the Secretary of Labor, and any agreement entered into by the Administrator or the Secretary, in effect under the provisions of the Fair Labor Standards Act of 1938, as amended, on the effective date of this Act, shall remain in effect as an order, regulation, interpretation, or agreement of the Administrator or the Secretary, as the case may be, pursuant to this Act, except to the extent that any such order, regulation, interpretation, or agreement may be inconsistent with the provisions of this Act, or may from time to time be amended, modified, or rescinded by the Administrator or the Secretary, as the case may be, in accordance with the provisions of this Act."
29 C.F.R. §776.0a