I have always used 120 minutes in the control panel setting for Tomcat Timeout and 7200000 in webapp.props and BASServer.props.
As near as I can tell, the Tomcat Timeout setting in the control panel controls the value in webapp.props. Since updating to 5.9 when I enter 120 in the control panel it sets the timeout to 7200.
I am having some stability issues and I think this is the problem. I would appreciate any advice.