820 ILCS 206/25

Except as allowed under Section 30, no employer shall employ, allow, or permit a minor to work: (1) more than 18 hours during a week when school is in session; (2) more than 40 hours during a week when school is not in session; (3) more than 8 hours in any single 24-hour period; (4) between 7 p.m. and 7 a.m. from Labor Day until June 1 or between 9 p.m. and 7 a.m. from June 1 until Labor Day; or (5) more than 3 hours per day or more than 8 hours total of work and school hours on days when school is in session.