average time for finishing london marathon
The average runner aged 20-29 finished over a minute later, with a time of 3 hours, 44 minutes and 47 seconds, The Telegraph reports. The overall average finish time for the event was 4 hours 6 minutes and 8 seconds.Read more: 1  London Marathon 2015: middle-aged runners faster than their younger counterparts-Telegraph.OU'LL SHRINK. The average marathon runner will be about 1cm shorter at the end of the race than when they began. This is because over time, the discs in the vertebrae compress, researchers at Swansea University found. However the height decrease is naturally reversed in about one dayâs time.