I did it last year. The title is very fitting. I finished it in around 9.5 hours I believe. My computer died about 3/4 of the way through the ride, so I was going off what someone else told me. I did it with a compact crank and 11/28 cassette. The last climb is hard. Very hard. But if you can make it over the previous climbs with a little energy left, you can grind up the final climb. And, there is no shame in walking. I passed many people walking. I'm not sure how I did it actually. I was just feeling really good that day.
I'm hoping to do it this year as well.