welllll.... I was erring on the side of caution a little, saying an average would be 45 mins; last year, the fastest lap was 23 mins. There is deifinately a hill involved of course, all on forest road, so although its a bit of a stretch at first, is only the first 10 mins or so.
the rest is quite technical, but all good dirty fun. A nice singletrack top section, another bit of rough forest track, and then your onto the downhill.
fear not, the clockwork will cope admirably!
Hope none of this has put you off, most folk that rode last year said that the course was well worth the climb.