Just an update on the Freetown50 yesterday - great race.

50 miles - 40% fire roads and some pavement. Singletrack was technical and fairly slow. Not a lot of mountain bike specific 'flowy' trails, but a lot cool backwoods stuff and varied terrain.
Almost no climbing.
If you are marathon-curious, I highly recommend you check this out next year.

Despite suspension issues and getting lost for 10minutes, I came in 3rd in the SS class (only 5 of us) . Prizes were among the best I've ever seen.