80 Ill. Adm. Code 150.675
Computation of Time
Section 150
Section 150.675Â Computation
of Time
The time within which any act
under this Part is to be done shall be computed by excluding the first day and
including the last, unless the last day is Sunday or is a holiday as defined or
fixed in any statute now or hereafter in force in the State, and then it shall
also be excluded. If the day succeeding such Sunday or holiday is also a
holiday or a Sunday, then such succeeding day shall also be excluded.