38 Ill. Adm. Code 200.220
Computation of Time
Section 200
Section 200.220 Computation
of Time
The time within which an action
required by the Act shall be done shall be computed by excluding the first day
and including the last, unless the last day is a Saturday, Sunday or legal
holiday, and then it shall also be excluded. If the date succeeding such
Saturday, Sunday or legal holiday is also a Saturday, Sunday or legal holiday,
then such succeeding day shall also be excluded.