Maximum Limit for Session Timeout

Unlike the common understanding that,the maximum limit for session time out is 90 minutes it is 525,600 minutes -- i.e., 365 days x 24 hours x 60 min

This is how we need to set in WebCofig file

stateConnectionString="tcpip=127.0.0.1:42424" 
sqlConnectionString="data source=127.0.0.1;user id=sa;password="  cookieless="false"      timeout="525600"
/>