Adjust web session timeout

If you are using SSO you can, as for normal local accounts not sure

Not really an exact answer to your question, and also mostly posting this for awareness for people still looking for an answer, since this thread is pretty old.  https://github.com/fveja/JSSCaffeinate

Thanks for this link. Installed Greasemonkey, imported the modified script and it works like a charm. No session time-outs in the Jamf Cloud anymore :-).