Depends on what area of Rockford your in... My place is right off of both Hwy 94 and 90 so its a great central area for a meet or an area to meet prior to going somewhere in Madison..
I used to drive to The Speed Shop in Loves Park, IL which is right next to the Rockford Race Track a few times a week when my car was there.. it took me about 40-45 minutes or so. Even if you are a few exits past that area it shouldn't take too much longer.
I'm down for a meet soon... only time that I have plans is Aug 5th as my buddy is getting married. (In Rockford as well, go figure)