The fastest time to travel to all London Underground network stations is 16 hr 20 min 27 sec and was achieved by Geoff Marshall and Anthony Smith (both UK) at Heathrow Terminal 5, London, UK on 16 August 2013.
Marshall and Smith were assisted in their attempt by Chris Green (UK) who planned the route and itinerary used as well as providing live support during the attempt with directions as to which train to take. The record breaking attempt was actually the 25th time that Marshall had made. The attempt began at Chalfont & Latimer station and finished at Heathrow Terminal 5.
Comments below may relate to previous holders of this record.