Yes, it really depends on the makeup of the person, and how well you use those training miles. Looking back, you had runners like Bruce Tulloh who could produce 14 mins, barefoot running, training 35 - 40 miles per week. I'd suggest this is a real exception, from an 8 stone talent.
Whatever mileage you do whether it be 40 or 100, you need to use them wisely, and you need to build up the mileage carefully. I really would try and find the money to join a club, and get some coaching. Otherwise you're going to be a busy fool, chipping off a second here and there. You have huge targets; you need this reviewed and backed up by the right advice and training programme
Edited: 02/09/2012 at 07:15