Steps to set session timeout for BaaS portal UI

Anybody here can help me with the steps to set session timeout for BaaS UI for 4.17.01?
Changing this din't work - /opt/apigee/baas-usergrid-2.2.0-0.0.250/source/conf/web.xml
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There is a web.xml inside the .war file. If we make the change there and reinstall the war, I am presuming it should work.