Haven't ridden any imperial centuries the past few years, but before that, (when in my early 60s), I rode several a year. All of them solo, a few as part of a charity ride, most self-supported. Riding solo, I'm satisfied if I average 15 mph. For a century, that would be a 6h40m ride. Add in stops and a lunch break, and it usually takes me around 8 hours to ride a full century. I can get in a metric century in around five hours. Any moderate amount of climbing will kill those times.
Last edited by volosong; 07-01-20 at 11:25 AM.