893.33(6) Actions to enforce easements, or covenants restricting the use of real estate, set forth in any recorded instrument shall not be barred by this section for a period of 40 years after the date of recording such instrument, and the timely recording of an instrument expressly referring to the easements or covenants or of notices pursuant to this section shall extend such time for 40-year periods from the recording.
https://docs.legis.wisconsin.gov/statutes/statutes/893/iii/33
