I rarely ever run 70 miles but, were I to, I'd be running twice a day in the week I guess (morning and evening). None of my running is particularly planned and its much more running for fun with the dog than 'training' but, in terms of distance, its typically 20 miles in the week (5 x 4 miles and all headtorched at this time of year) and anything between 20 and 30 miles at the weekends. Its pretty much 99.99999% off road in the hills with say 7,000 to 10,000 ft of climb each week.