I managed somewhere around 22 miles in six hours yesterday, mountain biking on Dartmoor - wasn't quite what I'd call relaxing though, and probably involved as much map reading, rest stops, walking, and hefting the bike over walls as it did cycling! Was a great day to be out in the countryside though
For more sensible cycling, I love trundling slowly around the back lanes on my 1930s roadster. The change of pace from my usual weekend rides can be just what the doctor ordered sometimes.