Mich. Comp. Laws § 200.62

Sec. 2. The caucus for such nomination shall be open from 2 o'clock p.m. to 8 o'clock p.m. on the day designated therefor. All votes cast at such caucus shall be by ballot, and all laws applicable to the furnishing of ballots and the depositing, counting, and canvassing of the same, provided by general law for the election of such village officers are hereby made applicable for such caucus: Provided, That the village council may direct that the polls of said caucus be held open from 8 o'clock a.m. until 8 o'clock p.m. on the day designated therefor.