how far has someone ran like whos the person whos ran the furthest

Question: how far has someone ran like whos the person whos ran the furthest
- Keywords:
  furthest,
  person,
  ran
Asked by AlfiePanther to Dan on 9 Mar 2018.
- Dan Gordon answered on 9 Mar 2018:
  
  Quite difficult to answer. However what we do know is the following:
  There is a race that covers 3,100 miles which was completed in 41 days
  24 hours non-stop running allowed te runner to cover 303.5 km
  7 days running on a treadmill allowed a runner to cover 853.4 km

Question: how far has someone ran like whos the person whos ran the furthest