Assuming you cross the start around 6:10, you finish 9:10. It takes between 20 and 60 minutes to get out of the finish area. The short time s just working through the crowds and not stopping at the med tent or standing in line for a medal photo. So assume an average of 40 minute - we are now at 9:50. It takes about 10 minutes to walk to the monorail, assuming a train pulls away just as you walk up, assume 20 minutes to board and 20 minutes transportation time. We are now at 10:50. Allow 15 minutes to get across the parking lot from TTC and into the center of the Poly so it is now about 11....
Hope that helps.