Mich. Comp. Laws § 500.5010

Sec. 5010. The corporate existence of any company incorporated under or subject to this code shall not exceed 30 years, unless a longer term is provided in the articles of incorporation. Any company hereafter incorporated under this code may incorporate for a period of any specific number of years, not less than 30, or multiples of 30, or in perpetuity, provided that the legislature may shorten such terms by future laws.