My pup's 8.5 months and I take him out for about an hour in the morning, usually setting off at about 10.30-11am, and then again for about 45 minutes to a park at the end of the street at about 3.45-4pm. Other than that he gets the odd loo break, and the occasional additional walk. He doesn't walk the whole time on these walks - often he potters about, plays with other dogs, or lies down to munch on sticks.