Since you have to cross the U.S. as well as the Atlantic Ocean, you are probably talking about at least 12 hours of flight time. However, a lot depends on the airline and your flight routing, connections, etc. Plus, you have to allow for security and boarding/luggage handling at each end of the flight. In any case I would suggest looking at a site such as Expedia, Orbis, Travelocity, etc. and making some sample flight plans so you can see how things work out.
18 HOURS + LAYOVER TIME IN PARIS
about 9 hours
Google Maps estimatesthe driving time as 9 hours and 26 minutes.
Nonstop, 2 hours by plane.
About 3 hours
Just over 11 hours.
it takes approx 6 hours
About 2.5 hours
none
the travel time by train between Paris and Cannes is 5H05 or 5H45 depending of the train.
A direct flight from Paris, France --> Glasgow, Scotland would take about 2 hours.
56 hours