I've done short days, but those don't turn into "rest" or "easy" since if I'm out on a bike, I'm finding things to do or see. For instance, in 2009 I had a day of 20 miles riding into Lewes, DE. But I spent that day fighting the surf at Cape Henlopen, or exploring town. Then again most of the posters here find physical activity comes a bit easier to them, so they might find that restful.