Much will depend upon the type of boat you are using. However, given you are using a power boat that travels at about 12 knots it will take you will need to travel down the River Thames into the North Sea, turn south and sail through the Straits of Dover, and then sail to Paris up the River Seine. Depending upon wind, tides, weather, etc, it should take you about 24 hours.
Container ships are too big to get into London Docks so you can't do the journey that you are asking about. At its closest point, Southeast England is only 22 miles from Northern France and the sea journey takes about 45 minutes.
A London-Nice travel is about one hour and a half, not taking into account the waiting times on the runway and before landing.
about an hour
2'10
a long way away. i think the same distance from london to France
travel by bus from London to Aberdeen it takes 364 days
About 1 hour.
2 seconds
It takes two hours from the UK to France.
You could, but that would involve taking the bus on a ferry across the English Channel and through two countries (France and Spain). The easiest way to get to Spain from London is to fly from Heathrow, Gatwick or Luton Airport (the flight should be about 2 hours long depending on where is Spain you are flying to).
You can not travel by train from CA to London. There is an ocean between the two.
Spain and France share a common border. It depends on your starting point and your destination, and what mode of travel you use.
About 4 hours