Except as otherwise provided in this section, 3 village trustees shall be elected at each biennial village election for the term of 4 years and until their successors are qualified. As an alternative, if provided by an ordinance adopted by the village all 6 village trustees shall be elected at the biennial village elections for the term of 2 years and until their successors are qualified. The term of office for a trustee elected at the village's regular election begins on November 20 after the officer's election and qualification.