Section 1
SECTION 1. It shall be the duty of the heads of departments and offices in the Philippine civil service to require of all employees of whatever grade or class not less than six hours of labor each day, not including time for lunch and exclusive of Sundays and days declared public holidays by law or executive order, but the head of any Department or Office may, in the interest of the public service, extend the hours of labor herein specified for any or all of the employees in his office, and in case of such extension it shall be without additional compensation.