I always question the "all day dogs." How fast can they possibly be moving at the end of an all day run? Is it even fun at that point? For me, if they're slower than 10mph I'll put them up. On a longer trip, with cooler weather, limit runs to 1.5 hours, 2 hours max, and rotate out dogs, resting a dog every third day. That is ideal IMO.
I understand the more versatile breeds don't really fly like pointers or setters, but if they're not moving are they even that effective? Just my $.02, no offense intended.