705 ILCS 310/10
When any elector drawn and summoned as a petit juror or as a grand juror shall appear in obedience to summons, any judge of the court in which he has thus appeared, if satisfied that, on account of the nature of the elector's occupation, business affairs, physical health, family situation, active duty in military service, or other personal affairs, service at another time will subject him to less inconvenience, shall have discretion to excuse him temporarily from service as juror or grand juror and require him to appear at a subsequent day not later than one year from the time of such excuse. And if any elector so excused shall fail to appear for service at the later day thus designated, his attendance shall be enforced in the same manner as is now provided by law for the case of his failure to appear in obedience to summons. When any elector has been so temporarily excused, the fact of such excuse and the day at which he is to appear for service shall be certified by the clerk of the court to the jury commissioners or the jury administrator. The jury commissioners or the jury administrator shall thereupon place the name of such elector upon the appropriate period jury list, if period jury lists have been provided for by the said rules, and, in any case, shall, at least ten days before the day at which he is required to appear for service, send him by mail a notice reminding him of his duty to appear. Failure to send such notice, however, shall not affect the duty of the elector to appear as required at the time of his temporary excuse. The number of petit jurors to be drawn by the clerk of any of the said courts for any given month, as provided in Section 9 of this act, shall be reduced by the number of petit jurors on the period jury list under duty to appear in that court at that month. A like reduction shall be made in the number of persons to be drawn as grand jurors as provided in Section 9 of this Act.
705 ILCS 310/10