Two settings control how long a LiveCycle Workspace session lasts.
1) The session timeout setting for the web container of your J2EE appserver.
For JBoss AS, the web container is Apache Tomcat. To change the default in JBoss AS Community Edition 4.2.1, navigate to %JBOSS_HOME%\server\<your_config_name>\deploy\jboss-web.deployer\ and edit server.xml Change the connectionTimeout for the HTTP Connector (as well as the HTTPS Connector, if you have configued one).
2) In the LiveCycle AdminUI, navigate to Settings->User Management->Configuration->Configure Advanced System Attributes and change “Session Timeout Limit (Minutes)” to a value that is the same or lower.
Re-start the appserver instance for the changes to take effect.