205 ILCS 740/20
At the conclusion of the hearing , a copy of the Board's report shall be served upon the applicant or licensee by the Department, either personally or as provided in this Act for the service of the notice of hearing. Within 20 calendar days after the service, the applicant or licensee may present to the Department a motion in writing for a rehearing which shall specify the particular grounds for rehearing. The Department may respond to the motion for rehearing within 20 days after its service on the Department, and the applicant or licensee may reply within 7 days thereafter. If no motion for rehearing is filed, then upon the expiration of the time specified for filing a motion, or if a motion for rehearing is denied, then upon denial, the Secretary may enter an order in accordance with the recommendations of the Board, except as provided for in Section 19. If the applicant or licensee orders a transcript of the record from the reporting service and pays for it within the time for filing a motion for rehearing, the 20 day period within which a motion for rehearing may be filed shall commence upon the delivery of the transcript to the applicant or licensee .
205 ILCS 740/20