lunacy

Hi I have an amzing 4 month old bedlington lurcher - I have had so many diiferent views on how much to exercise her. She was out with me for an hour or so today - lots of rests and meeting other dogs, kids, people. I let her off twice for 5 mins plays with her mate - a lakeland cross - she does run round alot but only for a short time. This is not every day - is this OK? she has slept since we came home. Thanks