Mich. Comp. Laws § 3.257

Sec. 7. (1) Not more than 30 session days or 90 calendar days, whichever is earlier, after receipt by the respective committees of the senate and house of representatives of a written certification described in section 6 from each of the boards of the affected counties, the legislature by concurrent resolution and a record roll call vote shall approve or disapprove the proposed acquisition of property rights by the United States. If the legislature fails to vote as prescribed in this section, the proposed acquisition of property rights by the United States shall be considered to be disapproved. (2) As used in this section, "session days" means those days on which at least 1 house of the legislature is in session.