735 ILCS 5/2-203. Service on individuals.
You have to respond within 30 days after being served. But the question is, are you being served by registered mail? See http://www.serve-now.com/resources/process-serving-laws/illinois
You have to respond within 30 days after being served. But the question is, are you being served by registered mail? See http://www.serve-now.com/resources/process-serving-laws/illinois