8 Ill. Adm. Code 1.105
Computing Time Limits
Section 1
Section 1.105 Computing Time
Limits
The time within which any act
under 8 Ill. Adm. Code 1.15 through 1.110 is to be done shall be computed by
excluding the first day and including the last. Saturdays, Sundays and legal
holidays for the State of Illinois shall be included in computing the time,
except that when such time expires on a Saturday, Sunday or legal holiday for
the State of Illinois, such period shall be extended to include the next
following business day.