I've been going on longer and longer rides during the weekends, and I think I've found my current limit, of 50.9 miles. I don't know if it was just the overall length of the ride, or that 5 or 6 mile section of the trail that was gravel and rock, that I encountered on the homeward leg, so that I had to power through even though most of my energy was spent. Anyhoo, when I got back, I spent the evening dealing with muscle spasms in my thighs and calves whenever I moved. I dub them "sparkle cramps" since they just pop up and are gone in the next instant. It cleared up after a "supper" of a cup of yogurt, and a cup orange jello from a batch I made up a few days ago just because it was there. Nevertheless, I am happy that I could do 50 miles at all.