Mont. Code Ann. § 20-1-304

A pupil-instruction-related day is a day of teacher activities devoted to improving the quality of instruction. The activities may include but are not limited to inservice training, attending state meetings of teacher organizations, and conducting parent conferences. A maximum of 7 pupil-instruction-related days may be conducted during a school year, with a minimum of 3 of the days for instructional and professional development meetings or other appropriate inservice training, if the days are planned in accordance with the policy adopted by the board of public education. The days may not be included as a part of the required minimum aggregate hours of pupil instruction.