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I did an upgrade from JHS 10.1.3 to 22.214.171.124 about a year ago. Release notes are included with the JHS install and upgrade steps are included in the release notes.
Time commitment for the upgrade is going to depend on how extensively you've customized the JHS templates, or customized the application outside of JHS. Because of the changes in ADF Faces components between 10 and 11, JHS will regenerate your viewcontroller project from scratch (after upgrading your existing JHS definition) and then you have to re-apply any template customizations to the new templates.
One nice thing is that, in 11g, a lot of things that you used to have to do via customizations are now handled by JHS, or by the updated ADF components, so I was able to throw away many of the custom templates I had used in 10g.
So if your viewcontroller is pure JHS (no customizations) the upgrade is pretty clean.