A teacher being a member of The Manitoba Teachers’ Society Executive Committee or of the Executive Committee of any branch thereof, or any special committee of the Society, or being appointed an official representative or delegate of the Society, or any branch thereof, and being authorized by the Executive Committee of the Society to attend a meeting of the committee for which the teacher is a member, or to act as a representative or delegate, shall be excused from school duties for either purpose or both purposes for not more than a total of ten (10) teaching days in any one (1) school year, provided that a substitute satisfactory to the Division can be secured, and the cost of providing such a substitute is assumed by the Society. A maximum of forty-five (45) days in total may be taken for the purposes mentioned above during any school year by members of the Association. No additional leave of absence beyond forty-five (45) days in a school year shall be taken for the purposes mentioned above except with the consent and approval of the Division, which consent shall not be unreasonably withheld. In all cases the teacher shall notify the Division ten (10) working days prior to taking such leave, wherever possible.