We've always let our dogs (pups) be our guide. It depends on terrain, heat, and humidity. I don't let them overexert but they are active animals that love to explore and roam. We just take breaks if they need them, and allow them access to water. I can't imagine waiting until a year. We have several places that they are off leash, Della is almost 6 months, she's been walking a couple miles for over 2 months with breaks.