Well worth an hour visit. We were astounded that you can just wander into this building and roam around to view the art on 3 floors - without any security checks. It's lovely and yes there are security people visible but you can wander freely and even sit in the gallery to listen to a Senate session which we did for 15 minutes or so. Staff seem proud to work here and are happy to stop and chat.
Make sure you pick up an brochure about the state capiltol. Very informative.