Mich. Comp. Laws § Article IV § 54: Limitations on terms of office of state legislators.

Sec. 54.

(1) A person may not be elected to the office of state representative or state senator for terms or partial terms that combined total more than 12 years. However, this limitation does not prohibit a person elected to the office of state senator in 2022 from being elected to that office for the number of times permitted at the time the person became a candidate for that office.

(2) This section is self-executing. Legislation may be enacted to facilitate operation of this section, but a law must not limit or restrict the application of this section.