OK, so…. I did it. Thanks for the advice uys….
The marathon section involved 2 huge mountains, and several swamps. Finished that with blistered feet and bruised ankle. Time was 6'47" which we're told equated to 3'40' on a normal marathon course…. the next 36 miles took a while! The course was brutal. Finish time 18'29", 1 minute inside the limit. I guess I'm an Ultra runner now.. Will be back next year better prepared.
Result was…. blisters over balls of both feet, both little toes entirely blistered, ankle bruised and swollen, pissing and shitting blood for a day, but apart form that I was fine. Frustrated that blistered feet made me walk when my fitness was good enough to run.
Mongolia was amazing, heaven on earth. Will post some photos when I recover from the 28 hour drive across a big field back to the capital. Just had a great $10 massage..
I didn't do this for fun, its for charidee – so go here and give away your money – I will recover without a breakthrough in medical knowledge – some people won't