How long does it take to download macOS Sierra on a MacBook Pro, and what are the keyboard shortcuts?

Forever if that MacBook Pro shipped with a version of macOS later than Sierra as you cannot install an operating system older than originally shipped with that Mac. No keyboard shortcuts…

Bearing the first paragraph in mind, as long as it takes for your current network access from the following:

How to download and install macOS - Apple Support

A Mac that can run Sierra can also run High Sierra and I would advise the latter. However, at this point in time, neither operating system provides the security protocols required by most current websites or email hosts. Browser vendors and software developers have dropped support for any version of macOS older than macOS Catalina. So you would be creating a operating system island with either choice.

Impossible to answer, as that depends entirely on your internet connection's bandwidth.

Sierra is about 5GB in size, so on a normal connection can take anywhere between 5 minutes to an hour depending on bandwidth available.

Keyboard shortcuts for what exactly?

Mac keyboard shortcuts - Apple Support

8 hours is very abnormal unless you have an excruciatingly slow connection. Might want to stop it and start it up again, seems like it just not working anymore.

Also, where are you downloading Sierra from exactly?

Delcoz_Kenya wrote:

How long will it take to download macos sierra?

MacBook pro keyboard shortcut?

[Re-Titled by Moderator]

Original Title: MacBook pro

You never state why you are needing to install an old macOS...?

Maybe there is some insight gained from painting a bigger picture as to what is you larger issue to begin with...

If I had to guess—8 hours(?)... your drive is working in a state of failure.