SandPine, when I was going to do the 12 hours of Tsali and the HH100 came out, I was only going to do the 50 because I wanted to have a good race at Tsali. Speaking from experience, doing a 12 solo 1 week after a 100-mile singletrack race (8-9 hours?) would be a recipe for disaster. 50 miles, however, would be a perfect tune-up. Gotta pick your battles and 6 days isn't enough time to re-fill the tank.