You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
I did the 'Hells Gate Hundred' which also starts in Furnace Creek back in 2011. Even at only one hundred miles and with 9,000ft of climbing it was a brutal event. Some of the other riders had to be put on drips to replace lost fluid at the end as they were delirious through dehydration.
I can't imagine what kind of state the '508 guys will be at the finish, especially if they do it non-stop. Even in October the temperature will still be in the high-30s and you can literally feel the moisture being sucked from your skin!
Death Valley is a great place for road riding. Just don't go in August.