This ride was what's called a "permanent populaire", the term for rides 100-199K in length. The one I did was 100K, or about 62 miles. We were four in all, and two riders were on "bents". My average speed was little over 12 mph, and I was slowing down the others. They were gracious and didn't complain about it -- and we did make the time limit =)
So far I haven't been on any more RUSA rides. I had hoped to go on a 200K brevet earlier this year, but realized that I wasn't ready. Now I'm working towards a (non-RUSA) century in September. Doing more RUSA rides is an item for me to put on my bucket list!