I've just read some people prefer 4 runs per week and some prefer 3. But what about every other day with a long run once a fortnight. This would actually be sticking to the easy day hard day rule recommended. The easy day being taken to the extreme (complete rest), and the hard day you could push the boat out as well (high mileage), I mean what is the best for 50miles a week training? 10 miles x 5 days a week, or 16miles x 3 days per week. I think that if your training for a distance event then the latter is the best way. Just look at what most ultra runners do - 3 or 4 really long runs a week and no more.