In the strictest terms I would assume this should mean riding 100 miles without getting off the bike and ideally without stopping In practice however road conditions, taking on food and water, answering the call of nature and punctures etc. will dictate otherwise. So what is acceptable? Stopping for a meal? Having a rest? Having a nap? Finishing the following day? As far as I'm aware, in running events, once a competitor is no longer competing, the event is over for them. Any opinions or actual criteria?