In shibboleth2.xml, <Sessions> element controls how the SSO process is managed by the SP. Following child elements inside Sessions control timeouts:

NameTypeDefaultDescription
timeout seconds3600 (1 hour)

Maximum inactivity allowed between requests in a session maintained by the SP. This inactivity applies only to requests to this SP and is not aware of activity between the browser and other web sites .

lifetimeseconds28800 (8 hours)Maximum duration in seconds that a session maintained by the SP will be valid.