Minn. Stat. § 344.12: VIEWERS TO FIX TIME FOR BUILDING.

If fence viewers have divided land and assigned fence responsibilities, they may set in writing a reasonable time for building the fence, having regard to the season of the year. If either party fails to build part of the fence within the time assigned, the other party may, after completing part of the fence, build the other part, and recover the viewers' fees and double the cost of building the other part, as determined pursuant to this chapter.