Specifies a time limit for active but idle Terminal Services sessions. You can use this setting to specify the maximum amount ...

"Specifies a time limit for active but idle Terminal Services sessions. 

You can use this setting to specify the maximum amount of time that an active session can be idle (that is, no user input) before it is automatically disconnected. By default, Terminal Services allows active sessions to remain idle for an unlimited time. 

To use this setting, select Enabled, and then select the desired time limit in the Idle session limit drop-down list. 

If the status is set to Enabled, active but idle sessions are automatically disconnected after the specified amount of time. The user receives a two-minute warning before the session ends, which allows the user to press a key or move the mouse to keep the session active. 

If the status is set to Disabled or Not Configured, the time limit for active but idle sessions is not specified at the Group Policy level. However, an administrator can specify time limits for idle sessions in the Terminal Services Configuration tool. 

Note: This setting appears in both Computer Configuration and User Configuration. If both settings are configured, the Computer Configuration setting overrides. Idle session limits do not apply to the console session. To specify that user sessions are terminated at time-out, enable the  "Terminate session when time limits are reached" setting."