105 ILCS 5/7-29

No action contesting the annexation of any territory to a school district shall commence unless brought within 2 calendar years after (i) the order annexing the territory shall have become final in the event of a detachment or (ii) the election results shall have been certified in the event of a dissolution. Where a limitation of a shorter period is prescribed by statute, such shorter limitation shall apply. The limitation set forth in this Section shall not apply to jurisdictional challenges.