NE London
I drive from North-East London (Woodford) into Luton every day. Get on the M25 - through the Enfield roadworks, up the A1M and in through Wheathamstead.
Total time door to door is between 1 1/4 hours and 1 1/2 hours normally (about 40 miles). Occasionally (but rarely) longer if there is an accident and sometimes shorter (best time since the roadworks went in is 55 minutes).
All of this is through rush hour traffic.
Hope this is useful.
James