0 - 1 of 1 tags for expiration time

Hello.
I need to set my viewpoint session never timeout.
In the "Teradata Viewpoint Configuration Guide" i find this metod:
1>Stop the Teradata Viewpoint portal
2>Open the file : /opt/teradata/viewpoint/webapps/ROOT/WEB-INF/web.xml and change this value :
 

<session-config>