I've found this much, thus far:
Alimony Laws in Illinois
Item 8, in particular, may be helpful to you.
and
Illinois Divorce - Maintenance Basics - Family Law Article
The section on "Rehabilitative Maintenance" may be helpful to you.
This part I've copied/pasted below shows that
the burden to prove you still need maintenance is yours:
"Such awards stress the importance of the recipient's duty to rehabilitate and impose a burden of proof on the recipient to demonstrate why the rehabilitation failed and why maintenance should continue. Still, "reviewable" awards are much more common than awards for a specific time with a right to seek an extension.
Typical reviewable awards might be for two or three years, during which time the recipient spouse has a duty to try to become financially self-supporting. Near the end of that period, the court decides if the recipient is financially self-sufficient. If so, the rehabilitation is complete and maintenance terminates. If not, maintenance may continue but only according to the duration and restrictions set by the court. It is not uncommon in such a situation for the court to grant a relatively short (i.e., up to one-year) extension at a reduced monthly amount, and to make that extension non-reviewable with no further chance of renewal. If, however, the court concludes that the recipient spouse has not made a good faith effort at self-sufficiency, maintenance should immediately be terminated."