The work week for all permanent paid members of the uniformed police force for municipalities adopting sections 7-292 to 7-294, inclusive, shall be an average work week of not more than forty hours, computed over a period of one fiscal or calendar year, as the municipality elects; provided, unless otherwise prescribed by regulation or ordinance, any time spent in an emergency in excess of any regularly assigned or scheduled work week in connection with any actual police duty, including time spent going to, working at or returning from any actual police duty, or any other work or duty classified as an act of emergency shall not be included in computing such average work week.