Right now it is set up for 4 days to get to Paris and see the sights there. Then a day at each of the other cities which leaves a day or two extra. Maybe I will just avoid Zurich and go thru Stuttgart. I was planning on a one day trip to Zurich but it is 400 miles from Paris and with the mountains I imagine there could still be snow. Could be a long day driving.
Overall the schedule is still completely flexible.