HT206770: About the OS X El Capitan v10.11.6 Update
Learn about About the OS X El Capitan v10.11.6 Update
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Helpful answers
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Oct 12, 2016 12:15 PM in response to SnogPapaby Carolyn Samit,If you are referring to upgrading to Sierra, it takes about 45 minutes to an hour on a high speed broadband internet connection.
Make sure your Mac can run macOS Sierra > macOS - How to Upgrade - Apple
If you are referring to the update from the support article you posted from, it shouldn't take more than a few minutes.