Yep, depends a lot on how much stuff you carry, how hilly the roads are, wind and weather and so forth.

You also need to allot time to set up camp, break down camp, cook, eat, buy food and water, take in the sights and so forth.

And of course... what's the rush? YMMV but I'd rather take my time and enjoy the ride rather than crank out 100 miles because I want to cover a round number of miles per day....