Speaking as a lowly mortal, and not the AMAZON that the rest of you are, I can say that the DR is HARD! Not as hard as a double I'm sure, but still alot of work. You have to train for it, and love hills. Think of each pass as roughly a Mt. Diablo, well, w/o the 17% at the top.

I've done 3 passes on two DRs. The first ride I had a great time and finished strong (and damn I wish I'd gone for 4 passes that year). But I also had a massive nose bleed at the lunch stop before finishing. The next time I did the ride I barfed before the second pass - weird sinus problems again I think. Now I'll stick to doing one pass, at my leisure, maybe with the pathetically decrepit SK , and cheer on you Amazons from the sidelines.