Wis. Stat. § 893.35
An action to recover personal property shall be commenced within 6 years after the cause of action accrues or be barred. The cause of action accrues at the time the wrongful taking or conversion occurs, or the wrongful detention begins. An action for damage for wrongful taking, conversion or detention of personal property shall be commenced within the time limited by s. 893.51 .
Wis. Stat. § 893.35
A wrongful detention claim is separate from a conversion claim. A wrongful detention claim may arise against a possessor of previously converted or wrongfully taken property. Under those facts, a wrongful detention claim is available and, for purposes of this section and s. 893.51(1), accrues at the time the property is obtained. No demand is necessary. Mueller v. TL90108, LLC, 2020 WI 7, 390 Wis. 2d 34, 938 N.W.2d 566, 17-1962. This section and s. 893.51(1) are statutes of repose, not statutes of limitation. A statute of repose provides that a cause of action must be commenced within a specified amount of time after the defendant's action that allegedly led to injury, regardless of whether the plaintiff has discovered the injury or wrongdoing. With regard to a wrongful detention claim, the statutes focus on when the wrongful detention begins, not when the property owner discovers or knows of the detention. Mueller v. TL90108, LLC, 2020 WI 7, 390 Wis. 2d 34, 938 N.W.2d 566, 17-1962.