Hi all and have patience with a newcomer.

I'm visiting London in a month -- for the first time -- and staying with a
friend who lives in Greenwich. Pondering the tube map from Heathrow, it appears
to be something like a 2-hour ride from the airport, to Green Park, to the
Jubilee line to South Greenwich. But then, I have no benchmark to judge how
long a ride it really is. Can anyone provide an estimate?

Being conditioned by New York subway maps, I have to admit the London schematic
map drives me nuts. I can't get a true sense of direction of how close a
station is to a landmark. Which leads to my next question ... do any geographic
maps of the tube exist? Where are they?

Well, it should be an eye-opener riding the London tube for the first time
after 3 years of living with New York subways. Anyone with experience commuting
on both transit systems who can venture opinions about the differences between
the two cities?

I've probably bothered you enough, but I welcome your opinions.

J