Wis. Stat. § 103.38: Eight-hour work day; applicability.

(1) Subject to sub. (2), in all engagements to labor in any manufacturing or mechanical business if there is no express contract to the contrary, a day’s work shall consist of 8 hours and all engagements or contracts for labor in a manufacturing or mechanical business shall be so construed.

(2) Subsection (1) does not apply to any contract for labor by the week, month or year.