No one can really say but you. That said I find that for me a longer tour doesn't equate to shorter days. My daily mileage is usually determined by the spacing of desirable places to stay and if on a popular route, also may be longer or shorter in order to stay with other riders met along the way. My mood and fitness level are also factors.

I am not inclined to take rest days myself except when I want to do so because of a desire to spend the day in a given place. On the TA we never stayed in one place for consecutive days, but in the Sierras we though Yosemite was worth stopping for several days. So I might stop to see a place or to do some interesting activity, but have never taken a full day to rest. I do take a short day sometimes and think of them as half days.