how long will it take to upgrade my device? the time it takes to upgrade to windows 10 will
Windows 10 â when you can upgrade, how long it will take. Microsoft has explained when and how its customers can upgrade to Windows 10. By Staff Writer-July 21, 2015. Free Email Newsletter. Subscribe. Microsoft is set to launch Windows 10 on 29 July 2015.icrosoft states installation, on average, will take âabout an hourâ. New devices may only take 20 minutes, while older devices may take longer than an hour. If you have not reserved your copy of Windows 10 before the roll-out starts, you will first have to download the installation files.