Hi judge, it does seem to be an inordinately long time to run the upgrade. It will not be a fault of w10 though, more likely to be your internet speed or connection. I can promise you that w10 is infinitely better than the dismal w8:1, and better than w7 by miles. You mention the option of reverting to w7, but will not be able to do so if the device you upgraded came with w8 as it's operating system. You can of course go back to w8:1 as you know. I think I would be rebooting, if you have not already done so, keeping you original back up and trying again.