Originally Posted by CNY James

I did 57 miles in September, at that point longer than any previous ride I had done (my longest was 40 up til then) I was surprised how "easy" it was to finish the ride. I wasn't in great shape at the time, in fact I think I had been off the bike for 2-3 weeks when I went for that ride. The ride was mostly flat but I did it on my single speed so the hills I did encounter required a little bit of grit. My average speed was somewhere around 17 mph. Not blistering by any measurement but I was satisfied. Again, single speed, no preparation and a lot of coasting to wait for my brother to catch up. I'm looking forward to doing it again in the spring, maybe solo.
You'll be fine, have fun with it.