Daleside
Last year I "got round" despite struggling with achilles problems at the time. My view is that provided someone has done the mileage the cut off's are achievable regardless of how fast they are running. For example in my case I got to the top of Pen - y -ghent in 43 mins without pushing myself too hard and reached the Ribblehead checkpoint / cut off with 15 mins to spare - progressing at this same steady pace I got to the Hill inn again with just under 15 mins to spare. I then walked most of the way up Ingleborough.

I wouldn't say I was a fast runner and I daresay there will be people at your pace to keep you company and while away the pain (only kidding - about that last bit - you'll enjoy every minute of it).

Go for it kid.