GN, you will give the novices a heart attack with that profile! It is not in scale, the hills are not nearly as bad as it makes them look .
Regarding distance and long runs, I will be attempting to obtain my green number on about half the mileage I usually do from the start of the year. I have had a multitude of injuries, and now topping it all off with bronchitis. So far this year I have run one 52km, and four 42km's. I am planning on doing MK this weekend (probably near maximum marathon pace), and then Halstead the following weekend at Comrades pace. That is then 3 weeks out which I consider the absolute minimum to recover from marathon distance. I certainly wouldn't go any further that weekend, and definately not a back to back.
Remember, it is always better to be undertrained than injured or tired - see you all on the road.