ZHR I endorse everything said by BFMK. I think its possible to get too hung up on an idea that you have to do a certain number of miles or a ceratin amount of climbing every week for n number of weeks or you wont do it. I had a friend who did it in 2007 through just a few months prep, mainly in the dark Peak and certainlyno where near 10,000 feet weekly. he only recc'd the route a few weeks before hand. I failed my first attempt mainly due to inexperience and lack of prep mainly on the diet front and too little hill training. A year later nailed it in 22 .20. I did concerntrate more on up and down hilling than previously but got no where near 10000 a week. I knew the route like the back of my hand by then and tried to put in a few 10/11 hour days in lakes and Wales during April and may but probably only 5 all in all. The rest i slogged up and down Kinder nearer to home or repped hills on the Dorset coast near to hwere my bro lives. the rest was sheer psych and determination. I visualised alot about what it would be like to finnish and used that to get me through diffcult phases. i think the key is be staedy and never give up and as BFMW says its a real psychological boost to be a bit ahead of your schedule so work to a 22 hour time table and you will by your self that time and feel good about it.

I gather you live in South. If I did i'd hit the downs and rep and rep, up and down and forget the undulating distsnce runs. good luck