I've done this run several times in the past few years. Since my marathon scheduled for Dec 6 was cancelled, I decided to race this route. It is much tougher the faster the pace, due to trail roughness. I saw a bobcat who was not seemingly bothered with my passing by. I got off trail at one point and decided to run through an ash pile to get back on course till I felt my feet really warming up! Had to backtrack about 100 yards instead. Probably came very close to melting my race shoes.
I figure my time was roughly equivalent to a 2:50 road marathon. So I'm sure I'll have to come back and try to lower the time even more.