Session expire time in phpCAS

[Veli AKÇAKAYA]

Hi,
We (Sabanci University) use the phpCAS client in uPortal Application. 
Session time in phpCAS is 3 hours but we want to set this time 8 hours 
but any isn't change in php.ini file. now uPortal session time is 8 
hours but we can't set php portlet's in uPortal session time 8 hour. 
After 3 hours of login to system although session time isn't finish 
uportal's session, PHP portlets's session is finishing an then again it 
want us to be login again. Is there any parameter about session time in 
phpCAS client, if not;  how set the session time?
Thanks...