It depends if you are on an airplane, boat, or a car.
18 hours
Parts of Surrey are within London so you will need to specify which part of London you are travelling from and which part of Surrey you are travelling to and which method of transportation you will...
In a Boeing 747-400, 12hrs 17mins. In a Boeing 737-400, 13hrs 1mins and finally, in a Boeing 777-300, 12hrs 53mins
45mintues, 380miles