(1)(a) No person employed on a full-time basis as a firefighter by any regularly organized fire department maintained by any incorporated city, municipality or fire district and that employs not more than three persons on a full-time basis as firefighters shall be required to be on regular duty with such fire department more than 72 hours a week. However, any affected incorporated city, municipality or fire district shall be deemed to have complied with this paragraph and ORS 652.070 if the hours of regular duty required of firefighters employed by it average not more than 72 hours a week over each quarter of the fiscal year of the employing city, municipality or fire district.
(b) No person employed on a full-time basis as a firefighter by any regularly organized fire department maintained by any incorporated city, municipality or fire district and that employs four or more persons on a full-time basis as firefighters shall be required to be on regular duty with such fire department more than 56 hours a week. However, any affected incorporated city, municipality or fire district shall be deemed to have complied with this paragraph and ORS 652.070 if the hours of regular duty required of firefighters employed by it average not more than 56 hours a week over each quarter of the fiscal year of the employing city, municipality or fire district.
(2) In the event this section shortens the working hours of firefighters employed by any such city, municipality or fire district, the total wages of such firefighters shall not for that reason be reduced.