Colorado Revised Statutes Title 8. Labor and Industry § 8-13-107. Firemen--hours of duty

It is unlawful for any municipality, or any officer or employee thereof, to require any person holding any position or employment in the fire department of such municipality, except one who may be at any time in command of the department, to be or remain on duty in such employment during any calendar month for periods of time which in the aggregate during such month amount to more than twelve hours for each day in said month. The requiring of more hours of work in cases of conflagrations or similar emergencies shall not be unlawful. This section shall apply to all municipalities having fire departments, whether such municipalities are created under general laws, or by special charter, or by or under the provisions of article XX of the constitution of the state of Colorado.