92 Ill. Adm. Code 454.130
Time
Section 454
Section 454.130 Time
a) Computation. In computing any period of time prescribed or
allowed by these rules, the day of the act, event, or default after which the
designated period of time begins to run is not to be included. The last day of
the period so computed is to be included unless it is Saturday, Sunday, or a
legal holiday in the State of Illinois, in which event the period runs until
the end of the next day which is neither a Saturday, Sunday nor a holiday. A
half holiday shall not be considered as a holiday. This rule shall apply to
the measurement of time forward, as well as backward from a specified date.
b) When the date designated for filing briefs or other documents
is a Saturday, Sunday or a legal holiday in the State of Illinois, that date
shall be extended to the next day which is neither a Saturday, Sunday, nor a
legal holiday in the State of Illinois. A half holiday shall not be considered
as a holiday.
c) Modification. Any time period may, upon request and for good
and sufficient cause, be modified by the Director in his discretion. Request
for extensions of modifications of time must be served on all parties at the
same time and by the same method of communication as service is made on the
Department. Only the original of the request need be filed with the Department.