I ride mainly 25-35 miles on my weekend ride . I stop at about 15-20 miles for a stretch break and water. I very rarely ride without at least one stop for stretching and drinking water. I live up on a hill so my ride always ends with a steep walk up a long hill which stretches my calves. There is no way to ride a vintage racing bike up the hill. I think the stopping to stretch is a good thing to do , but it would be different for each rider depending on your particular level of fitness and how often you ride , along with your age . I am 65 and pretty fit , I ride 2-3 times a week and walk about 2 miles a day. Joe joesvintageroadbikes.wordpress