(a) Every adjudicatory proceeding must be completed within 150 days of the date of the hearing stated in the notice of hearing. A request for an adjournment extends the time period by the length of time the adjournment is granted.

(b) Prior to the expiration date, the Attorney General or the hearing officer may extend the time period for no longer than an additional 120 days by a written determination mailed to all parties that the proceeding cannot be completed within 150 days and the reasons for the extension.