For a tax that is authorized after the effective date of this section for intermediate school district operating purposes, the duration of the authorization for the tax shall not exceed 20 years. The authorization for a tax described in this section may be renewed with the approval of the intermediate school electors for a duration not to exceed 20 years. The duration of the authorization for a tax described in this section shall be stated in the ballot question concerning the levy or renewal of the tax.
MCL 380.625b