My idea of a ride is about 15 miles and about 1 hour. I am getting good workout, tired and a bit stiff but also happy and pumped up. I try to alternate between running, swimming and biking and each of this activity gives me a slightly different kind of workout, pleasure, satisfaction and feeling of accomplishment. I admire those older than me (63yo) that can seemingly ride much longer and a number of days per week, but I have no plans to push myself beyond what my body and my mind tells is right for me. For me, biking must be foremost a fun activity.