80 Ill. Adm. Code 2700.840
Days and Dates
Section 2700
Section 2700.840 Days and
Dates
Whenever a time limit is
expressed in terms of a number of days, they shall be consecutive calendar
days, including weekends and holidays. If the last day of a period of days
would occur on a weekend or a holiday recognized by the State of Illinois, the
last day of the period shall be the next business day following.