I wish I could give you a better answer than this, but this is the actual answer: no one can tell you when the time is right because the right time to come back is different for each person and each person may have different timing requirements after each marathon. As with so many things running-related, the answer is to listen to your body.
I ran Chicago as well, and took all of last week off and then went an easy 3 on Monday and off yesterday. I will probably run only 3-4 days this week. I have done two other fall marathons - NYC 2014 and Chicago 2015. In each case, I then came back and ran my local half marathon in early December, and in each case I was barely able to run my first half split from my marathon at that race.
I would also give some consideration to what workouts you are going to try to do as your early workouts back. A vo2max workout is an awfully tough way to come back to the track. Yesterday I was discussing the "first workout back" issue with a friend who also ran Chicago. He was thinking he would start back with a 20 minute tempo run on the track. I suggested 3 x 200, 3 x 400, 3 x 200 instead, with the reps being untimed and treated as long strides. Another friend suggested a few miles of "stride the straightaways and jog the turns." Both workouts are intended to serve the same purpose: help re-establish good mechanics and breathing rhythms without stressing your energy systems too much. Essentially, a rust buster and a building block for more efficient future workouts. Also something that you can walk away from feeling good since you are not timing yourself. Just food for thought.