Predetermined Time of Inactivity

A predetermined time of inactivity is the maximum idle period allowed before a system takes protective action, such as locking a screen, ending a session, or requiring re-authentication. It helps prevent unattended sessions from becoming unauthorized access points.

Idle timeout is based on a lack of user activity, such as no clicks, typing, or requests. Session timeout may refer to any limit on a session, including inactivity-based limits, fixed maximum session duration, or both.

Compliance programs commonly expect organizations to limit access when users are no longer actively using a system. Automatic logoff or session lock reduces the risk that someone else can use an unattended device, browser session, or privileged account.

The right inactivity period depends on system sensitivity, user role, device type, work environment, and business needs. Higher-risk systems, shared devices, and privileged accounts usually justify shorter timeouts than low-risk internal tools.

An inactivity timeout policy defines how long systems may remain idle, which systems are in scope, what action occurs after the limit is reached, and who approves exceptions. It should be practical, measurable, and consistently enforced.

Automatic logout can be configured through application settings, identity and access management controls, endpoint management policies, operating system settings, or custom session handling. The implementation should match the documented policy and be tested regularly.

Best practices include setting shorter timeouts for sensitive systems, applying consistent rules across similar applications, requiring re-authentication after timeout, documenting exceptions, and reviewing settings after major system or risk changes.

It reduces the window of opportunity for someone to use an unattended active session. This is especially important for shared workspaces, remote work, privileged accounts, customer data systems, and devices used in public or semi-public environments.

Useful evidence may include documented policy requirements, configuration screenshots, endpoint management settings, application session settings, identity provider policies, test results, system logs, and records showing periodic review of timeout values.

Information Security & GRC requirements generally expect organizations to define, implement, monitor, and review inactivity timeout controls for systems where unattended access could create risk. The requirement should be supported by policy, technical configuration, and evidence of operation.