The subway does not go as far as Rochester in Kent. You would need to go by train and it will probably take about an hour.
about 15 minutes from london
About 3 hours
around 40 miles depending upon your exact start point, how long it'll take depends heavily upon traffic
how long does it take to get train from london to runcorn
6 hours
not very long
how long it takes from Wellington to London how long it takes from Wellington to London
how long does it take to fly from benin to london
About 4.5 hours.
1 hour and 20 minutes
12 hours!!
17 days