About 4 - 5 hours depending on traffic
5 hours
An hour with no traffic.
as long as you make it
2 hours and 6 minutes
About 2 hours
It all depends on your mode of transport. If you fly it would take about 3 hours. If you drive, about 3 days.
There is no canal between London and Southampton.
between 4h 40mins and 4h 50mins.
Southampton to Harwich = 172.7 miles and will take approx 3 hours 9 minutes to drive according to AA route planner.
The county of Hertfordshire adjoins London, so it would depend on which part of Hertfordshire to which part of London and the traffic conditions at the time.
It takes about 1 hour and 58 minutes and the approximate distance is 89.91 miles.
It will take about 2 hours 12 mins at the moment (11 am on 28th July 2017).