We do it FAST on a horse in 1 1/2 hours..slow 2 or so hours..we have had peeps tell us they bike in 45 minutes it is 8 miles...lots of mud streams you have to walk over
It is about 8-9 miles depending on water levels so ... how fast do you go? Do you jump logs or walk the bike over them, etc. Some of it is fast some not so much. Say an hour to be safe. There may be some sections you want to play with a couple times. Wear a helmet.