Jim has a problem. He writes: “How long does the Windows 10 installation take?  There’s no mention of it in Chapter 3 of the guide. My ‘installation’ has been running for nearly 20 hours.  When I bring up the ‘Get Windows 10’ information screen, I’m informed that Windows 10 is downloading.  When I check the download progress option, a quick message appears (too fast to read completely) and then disappears. The download has been running by itself since 9pm last night. Do you think it’s almost done?
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Jim, you definitely have a problem. My upgrade to Windows 10 took around and hour or so. For some people it takes a little longer, but it definitely should not take all night.
You may want to start again, or it might not be a bad idea to contact Microsoft Customer Service. They may have some troubleshooting information for your particular PC.
~ Cynthia