Keep track of both. Why not? When you're fit and experienced with long rides, you may find that stopping to rest will increase your moving time rather than decrease it because rather than being beneficial, it takes some time to get your legs up to speed and working efficiently again after a prolonged stop. (You may have noticed racers warming up rather than resting right before a race.) For that reason I keep my pit stops as short as possible, only long enough to refill bottles and pick up something to take along to eat, (and pee as needed). If I had a support vehicle to pass me filled bottles and food, I guess I wouldn't stop, except perhaps to pee.