Dogmatix:
4 hrs 20 minutes each way
which way did you go? no hold ups then 
Well I actually started at Mondi (Bux Box) in rushall, but the time it takes you to get out of the back roads at 4am is probably the same as it takes to come along the Harleston to diss road.
A143 - A14 - A1(M)/A1 - A64 - A19