I guess you are talking about session time out.
You will need to change the session timeout in all the war files of the portal, including portal-server.war, portal-core.war...
If you are only using JBoss Portal on your JBoss AS instance, it's probably less error-prome to change this at the tomcat level as explained in the first section of the Wiki.
Yes, in the web.xml of tomcat i have a session-timeout of 30, and in the web.xml of portal-server.war a session-timeout of 15. In the others .war there isen't session-timeout.
If i change the session-timeout of portal-server.war to 30.. will i have 30 minutes?
Or simply remove the session-timeout from portal-server.war so that you have a unique place to change if you need to.
thanks for the reply Thomas.