track chick wrote:
It's going to be between 15 and 20 minutes. Walk down a street near you or go into a shop, look at the average 30 year old guy. If this is assuming no training - they just go ut and run one mile... people aren't going to push themselves and a lot of people will massively struggle after 5 minutes (if not before). Also, take into account the large number of people now with medical problems and disabilities at that age.
I jumped to the last page of this thread and was going to post the same thing.