A lot depends on other factors -- your age, fitness, terrain, how much gear you are carrying. However, I find that 60-65 miles (or roughly 100K) is a comfortable average daily distance on bike tours. We can generally ride this distance in 4-5 hours, allowing enough time for a leisurely breakfast, lunch, stops to view scenery and other attractions along the way, and reaching our destination in time to clean up, eat and sight see in our destination town. I generally ride one or two week-long tours every year as well as some shorter trips. Some days we might ride 70-80+ miles, other days 40-50, but it usually averages out to 60+/day.
Last edited by tarwheel; 09-17-14 at 06:32 AM.