Upgrade

On the 31 October 2015 I went to Incredible Connection for an upgrade to Windows 10 on HP laptop Windows 8.1. The technician called Jonathan promised to call and inform me if they encounter any problems on PC during an upgrade, but he didn't give me a call up until 12 November 2015 when I decided to show up at store to check the progress. He told me that they are still running few tests and that the ram/ space of the PC is unavailable when they try to find it. So he promised to call me the next day but he didn't. I just called him myself this afternoon and he say they will reinstall Windows 8.1. Im waiting for 16 full days already. Someone must please tell me how long does it really take to upgrade Windows???