We took this tour 8 years ago and had a fabulous time!
In the narrated photobook that I later made, I mentioned everyone's post-tour plans, so I consulted that book just now so as to be able to answer your question.
There were 12 married couples on our Village Italy tour.
My husband and I spent one final day and night in Varenna and then flew home from Milan the next day. We weren't yet retired and couldn't extend our vacation with multiple post-tour nights, but we'd always wanted to visit Varenna, and being so close to that town at the end of the tour, we couldn't resist the opportunity to get over there for one final day after the tour. Some would say it takes too long to get there from Lake Orta, for just one night, but for us, it was the perfect way to end the trip, relaxing and unwinding, some quiet time just to ourselves, in a beautiful place, reflecting on all the wonderful experiences we had for two weeks. The next day, it was pretty easy to go by train to Milan's airport for our flight home (regional train from Varenna to Milano Centrale station, then transfer to the Malpensa Express to the airport.) .
Only one couple was remaining behind in Lake Orta for another night, and only because they'd made an error in booking their flight home, thinking the tour ended one day later than its actual end. Lake Orta is lovely but small. The consensus of tour members, I recall, was that the one day and overnight we had there with the tour was enough. This couple who ended up with one extra day reported later that it was a bit depressing to be there by themselves for one extra day, all of their new friends having departed, no one left to socialize or dine with.
One couple left Lake Orta after breakfast on the final day, headed to Tuscany for a week-long stay in a villa.
One couple went to Milan on the final day of the tour, for one last overnight before flying home the next day. They had reservations to see the Last Supper.
One couple flew out of Milan to London on the last day of the tour, intending to spend a few days there before going home.
Five couples shared 2 taxis to Milan's airport on the final day of the tour, for their flights home to the U.S., one taxi departing before the final breakfast and the other departing after breakfast.
Two couples who had come on the tour together had booked a couple of post-tour nights in Stresa, then they were going to be traveling up into Switzerland to extend their vacation.
You're going to have a wonderful time on the Village Italy tour!