You can count on 7-8 hours in the air; however, a lot depends on the airline and your flight routing. 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.
That depends on which part of England and which part of France. London to Paris is about one hour.
This may depends on from which city and airport you are taking your flights to France from England, but Flights to Paris from London took almost 2 Hours.
pending on what plane your on it will take 12 hours
About 100 minutes
About two hours
It takes 3hour from Slovenia to London by plane.
There are no direct flights between London and Hawaii.
it will depend on where you are flying from
Around 1 hour.