My recent experience was to leave at 11:04am after a scheduled 10:45am departure and arrive at 3:56pm ahead of a scheduled 4:15pm arrival.
We battled head winds of more than 50 mph for most of the flight yet lopped so much time off the schedule. For the first time in 18 years we did a straight in approach to 27L at Heathrow and I was on a departing Piccadilly Line train at 4:40pm.
Not a bad flight on Malaysian Airlines from Kuala Lumpur.