I sit at the back of the Peckham Rye service arriving 0826 (because it's quieter and staff often ask people to move towards the rear of the train).
It takes me 60 seconds to walk from the barriers to the front of the train in the evening peak and about 4-5 minutes to get off the platform during the morning peak.
It's a very slow shuffle with some periods of stopping, not a slow walk.
Well that's not my experience, but then it does vary by train.
Besides, it is approx 250 metres from the barrier line to the front of an 8 car train on platform 15; fair play if you can do that in 60 seconds.
