20 ILCS 5/5-716

(a) In this Section: "Military service" means any full-time training or duty, no matter how described under federal or State law, for which a service member is ordered to report by the President, Governor of a state, commonwealth, or territory of the United States, or other appropriate military authority. "Service member" means a resident of Illinois who is a member of any component of the U.S. Armed Forces or the National Guard of any state, the District of Columbia, a commonwealth, or a territory of the United States. (b) Each director of a department is authorized to extend any deadline established by that director or department for a service member who has entered military service in excess of 29 consecutive days. The director may extend the deadline for a period not more than twice the length of the service member's required military service.