Originally Posted by Riveting

Here in Denver, with hills everywhere and almost unavoidable, in order to maintain consistency of stress during knee-hab (as I call it), one must monitor time, and NOT mileage, since riding 10 miles uphill is not nearly the same as riding 10 miles on the flats. I typically choose to ride for a max. of 3 hours if my knees are bothering me at all. If only on the flats that could be 45-50 miles, but if I instead do a long climb up a canyon, those same 3 hours of riding might only be 20 miles (10 up and 10 down).

Different pedal strokes for different folks.