2021 Tennessee Code
Part 1 - General Provisions
§ 6-54-139. Action or Proceeding to Set Aside the Charter of Municipality or to Challenge the Legality of the Municipality's Existence

then any action or proceeding in any court to set aside the charter of such municipality or to otherwise challenge the legality of the municipality's existence as a political subdivision of this state must be commenced within ten (10) years of the date the municipality was first incorporated.