Length of wear is variable. Because we designed the K9 Top Coat to conform to your dogs body style coupled with the use of high quality, lightweight, breathable Arctic Fleece material, your dog can wear the Arctic Fleece Bodysuit for days (as long as you are able to control temperature and monitor the dog safely). Again, use common sense-regularly monitor and inspect your dog, provide water and shade, and talk to our staff if you have any additional questions.