Here's a link to the route description. In brief: roughly 200 miles, 24,000m of total climbing. that's just under 79,000 ft. Even if you made this into a 100-miler, you'd still have more elevation than either Hardrock or UTMB. Some of the fastest finishing times are in the 80 hour range.
I'm not sure if I would even want to do something like this...or could, for that matter.