How many hours is it driving time from swansea to dover?

According the AA Route Planner (GB Edition) the distance is 271 miles, this will take about 4 hours and 34 minutes to drive, assuming you take the direct route from/to the centre of each location, drive safely and there are no stops, accidents, breakdowns or other unusual hold ups en route. Safety tip, never try to drive more than a hundred miles without taking a break.