forums.bestbuy.com › t5 › TV-Home-Theater-KnowledgeTV Wall Mounting & Installation - Best Buy Support Sep 05, 2018 · How long will the installation take? When you schedule your service, your appointment time will fall within a 4-hour window. While there are a number of factors that can affect the length of an appointment, a standard TV Mounting and Installation job usually lasts between 90 and 120 minutes.