Illinois reviews references and experience after the exam is passed. Here is my timeline for "Endorsement by Exam" application.
04/17/15 - PE Exam taken
05/27/15 - Exam Results Released on NCEES site
05/27/15 - Mailed my "Endorsement by Exam" application with references, transcripts, experience, & $100 fee.
05/29/15 - My priority mail flat rate envelope with above items was delivered to IDFPR.
06/11/15 - My application fee check was debited from my account.
06/15/15 - My application was uploaded into IDFPR's internal database. At this point it wasn't reviewed and was in queue waiting to be processed.
06/16/15 - I called for an update on my application and was given the info listed in the line above.
06/17/15 - My license number was posted online.