Have I planned too much?
 

Fly JFK to London Virgin Upper- 2 days in London -Chunnel to Paris for 3 days-train to Bayeux for 3 days-train to Beaune for 5 days-train to Paris-then transfer to Eurostar-stay in Windsor for 2 days and fly home. Have I pushed too much into a short amount of time? We have been to London and Paris. That will not be a franic mess to see everything. Want to see Normandy for my husband as his father who died when he was little boy and landed there on D Day. Beaune is to visit vineyards that we do business with. Windsor cause its closer to Heathrow. All thoughts are welcome!!!

My first thought is that rather than returning to Paris to get to Windsor fly from Geneva to Heathrow.

Second thought is to get a multi-city ticket so you fly home from Paris rather than London and move Windsor to the start of your trip.

You could also look at flying into Normandy from London so as to avoid the need to travel into Paris then out again.

http://www.skyscanner.net/cheap-flights-map

Sounds quite nice to me... even more if you have been in Paris and London before !
That means more time for the rest !

Unless you love riding trains, why backtrack?

Heathrow-Windsor-London-Paris-Normandy-Beaune-Zurich-Home

I assume you have been to London and Paris before given the small amount of time you are spending in each.

Agree that backtracking is a waste of time - better to do open jaws ticket.

Also I would rent a car on leaving Paris. It will give you much more freedom to tour in booth Normandy and near Beaune - where reaching many places by public transit can be very difficult and time consuming.