Herein lies the difference between V & me. 
I was on the same ride. I thought I was ready & I was really looking forward to it.
My back & shoulders started hurting at about mile 30, and over time my neck and legs joined in, and then my head started pounding. By the time I reached mile 45 (Moskovite Corners) I decided there was no way I could gut this one out, and I wanted off my bike NOW.
(As an aside, my back almost never hurts on a ride, especially after only 30 miles. There was definitely something else going on.)
So, I got off my bike, called Lee (who had driven me up & was in the area but was currently on a ride and wouldn't be there for over 2 hours), laid back in a sunny spot on the decking at the side of store, and alternately watched the world go by & dozed.
On one hand, I feel like a wimp and a total loser for not sticking it out and bailing so early into the ride. Especially seeing how V stuck it out. It's becoming pretty obvious that I just don't have the right kind of tenacity for these long distance rides.
On the other hand, this is supposed to be fun. I was most definitely not having fun. I didn't even want to attempt the last 20 miles to the control at Pope Valley, even though I knew I would have been able to score a Haagen-Dasz bar at the Pope Valley store for my effort (the store & restaurant at Moscovike were closed for renovations). That's how much fun I wasn't having. 
(fwiw, I think I am coming down with something, I don't feel horrible today but I'm still achey and I definitely don't feel good.)
I'll give it a few days and re-evaluate.
2009 Lynskey R230 Houseblend - Brooks Team Pro
2007 Rivendell Bleriot - Rivet Pearl