This field specifies the session time-out interval in minutes, 0 to 300, defaulting to 30, after which an idle session is automatically logged off, with 0 disabling the timeout. An operator shortens this for higher-security environments where sessions left open on unattended terminals pose a risk, or lengthens it for users who need long-running sessions without being repeatedly logged out. Setting this to a low value on a shared operations terminal reduces the risk of someone else continuing a session left open by mistake.