What is the statute of limitations for felony theft in Illinois?

Answer 1

Generally 3 years

Quoting 720 ILCS 5/3-5 - General Limitations.
(a) A prosecution for: (1) first degree murder, attempt to commit first degree murder, second degree murder, involuntary manslaughter, reckless homicide, leaving the scene of a motor vehicle accident involving death or personal injuries under Section 11-401 of the Illinois Vehicle Code, failing to give information and render aid under Section 11-403 of the Illinois Vehicle Code, concealment of homicidal death, treason, arson, aggravated arson, forgery, or (2) any offense involving sexual conduct or sexual penetration as defined by Section 12-12 of this Code in which the DNA profile of the offender is obtained and entered into a DNA database within 10 years after the commission of the offense and the identity of the offender is unknown after a diligent investigation by law enforcement authorities, may be commenced at any time. Clause (2) of this subsection (a) applies if either: (i) the victim reported the offense to law enforcement authorities within 2 years after the commission of the offense unless a longer period for reporting the offense to law enforcement authorities is provided in Section 3-6 or (ii) the victim is murdered during the course of the offense or within 2 years after the commission of the offense.

(b) Unless the statute describing the offense provides otherwise, or the period of limitation is extended by Section 3-6, a prosecution for any offense not designated in Subsection (a) must be commenced within 3 years after the commission of the offense if it is a felony, or within one year and 6 months after its commission if it is a misdemeanor

There are a number of subsequent statutes which detail when the statute of limitations may be tolled (extended), and periods excluded from limitation.