Multimap says 12 hours, but I think you could do the whole thing over one day
Washington, Tyne and Wier is 2 1/2 hours from Gasgow. Washington, West Sussex is 7 hours away.
This cannot be answered properly without knowing what your speed is.
About 5 Hours east on I-76 TURNPIKE.
It would take about one hour to go from Barnet to Cambridge.