Folkestone to the Seven Bridge...?

Hello, I'm making a journey from Folkstone to then cross the Seven Bridge on a Monday sometime soon and was curious of roughly how long this car journey should take? I don't plan on making any stops and I start the journey at about 2:00pm if that helps when it comes to considering any typical traffic. I understand that there will be slightly different routes but I'm going to use the sat nav too which will hopefully take me down the quickest one :) so just a knowledge based estimate will be very much appreciated! Thanks! :)