SZ I reckon an average 4 min miling pace should be within your capabities and FWIW rest on the ascents with a bit of welly on the descents and flat, that way you should avoid Burning yourself out,
It is of course dependent on the amount of appropiate training you have done, and how familiar you find the terrain underfoot, also remeber you will be running some of it in the dark, and that will slow you down (again don`t burn yourself out by running outside yourself to cram in the miles before dark,nothing worse for morale than feeling shattered and needing to navigate in the dark).
Set yourself a few goals that you will be happy with, Starting with the 12hrs as being your first maybe ambtious goal,(then work out a few more that will give you options on the day ) with a finish in whatever time being a satisfactory end to a great day out being the final goal.
IF and when one goal starts looking out of reach quickly aim for the next goal and so on, that way you should not become despondent if things start going belly up.
Because as you know an extremly large % of sucess or failure in ultra running is governed by your mental approach i.e. stay positive and you will finish.
I really don`t think you need me to tell you any of this but as ever it works for me and if it helps others I am happy to pass it on
Oh yes HP 40 is a thin comparasion
Edited: 13/07/2010 at 15:06