Illinois Statutes Chapter 105. Schools § 5/24-6.3. Retirement trustee leave

(a) Each school board employing a teacher who is an elected trustee of the Teachers' Retirement System of the State of Illinois shall make available to the elected trustee at least 20 days of paid leave of absence per year for the purpose of attending meetings of the System's Board of Trustees, committee meetings of such Board, and seminars regarding issues for which such Board is responsible. The Teachers' Retirement System of the State of Illinois shall reimburse affected school districts for the actual cost of hiring a substitute teacher during such leaves of absence.

(b) Each school board employing an employee who is an elected trustee of the Illinois Municipal Retirement Fund shall make available to the elected trustee at least 20 days of paid leave of absence per year for the purpose of attending meetings of the Fund's Board of Trustees, committee meetings of the Board of Trustees, and seminars regarding issues for which the Board of Trustees is responsible. The Illinois Municipal Retirement Fund may reimburse affected school districts for the actual cost of hiring a substitute employee during such leaves of absence.