On the site, there are questions where 30 (48km) miles is considered a long distance, and up to 50 (80km) miles also considered a long distance.
Anyhow, a beginning, out of shape cyclist could consider that 15 or 20 miles is a long distance. And, an experienced cyclist could consider 50 miles to be just a workout.
Distance is apparently highly subjective depending upon the individual.
Is there a way through tagging or whatever to nail things down a bit?
Last Saturday, I packed up my jersey with granola bars, filled my water bottles and headed out for a 52 mile ride. Considering some questions, one would think that this was an Everest Expedition.
And... please do not take this as condescension...I fully understand that "long distance" has multiple definitions.