Check out this http://www.taffs24hourchallenge.com this guy ran / matched / walked non stop for 24 hours, all for charity mate, he did the challenge last friday/sat when it was raining all day and night and blowing a gale. He also did it with a 15Kg back pack and he is 40 so no spring chicken. Part of the way in he apparently broke his leg and ripped some tendons but he still carried on for another 40 miles to complete the 24 hours. His total distance covered was 125 miles, heck I have trouble walking 125 metres. If anyone can donate then I'm sure he would appriciate it as the all the moneys going to good cause's. He'll be out of action until xmas so I wish him well. Heck some army guys are tough.