Riding the Southern Tier, I took a four-day layover in the middle (at home!), but other than that did not have any zero-mileage days. Most of my days were on the long side, but I did have four short days sprinkled in there. Only one was really for R&R—stuck between the two most mountainous days of the ride—and I was glad I took it. The others I took more for scheduling reasons.