I average 55-65 miles/day if it's mountainous, 70-90 if it's flat (please god noooo!!!!) and I take a day off every 6 to 10 days. If there are non-riding attractions, I take more days off or may take shorter days for transit between attractions (I did short days in Tasmania, for example, where the national parks I was visiting were close together). I usually figure 350-400 miles/week.