The Tour Operator screwed up our day in Milan. We had a written confirmed tour for 9:30 in the morning from Viator. When we showed up, we were informed that they had overbooked the tour and that we had been moved to 2:30. We had planned to take the tour in the morning and then visit other sites that were not covered in the tour in the afternoon. Unfortunately, moving the tour to the afternoon both chopped up the day and kept us from being able to know the items that were not covered. For example, we knew that the tour included the Duomo, but we did not know that the tour would only give us an inadequate 5 - 10 minutes to view the interior and would not allow us to go to the roof. So we missed out on both of the highlights of Milan. The tour guide started out slow, but did an excellent job on the castle and the last supper description. Far too little time spent at the Duomo.