It takes roughly two hours to travel from Dover to Calis. Sometimes different ferries can take longer but sea France which is the one most used takes 2 hours max! Theres lots to do onboard anyhow to...
I have done this in 7 hours driving at an average of 90-100mph stopping only for fuel twice (about 5mins stop each)
It will take about 3 hours to drive the 296 km. (184 miles).
the distance from Calais to Biarritz is 1070 km. This is a driving time of nearly ten hours.
I have just completed this journey and it will take approximately 3 hours, depending on weather and traffic it may take longer.