2.05.060 [Rule 4] Computation, Shortening or Extension of Time
(a) Computation of Time
In computing time limits required by these Rules, or by order of the Appellate Court, or by any applicable law, the day of the act, event or judgment shall not be included. The last day of the period so computed is to be included unless it is a Saturday, Sunday, or court holiday, in which case the period shall extend to the end of the next business day which is not Saturday, Sunday or court holiday.
(b) Shortening or Extension of Time
The time for doing any of the acts provided for in these Rules, or by order of the Appellate Court, or by any applicable statute or ordinance, may be shortened or extended upon stipulation and approval by the Appellate Court, or upon written motion for good cause shown, but the Appellate Court may not shorten or extend the time for filing a Notice of Appeal.
(c) Additional Time After Service by Mail
Whenever a party is required or permitted to do an act within a prescribed period after the filing of a paper and the paper is served on the party by mail, five (5) days shall be added to the prescribed period.