This attribute indicates the maximum duration of executing a test on the specific port. This entry applies to all the test operations. The resolution will be a minute, and the maximum duration is limited to 30 minutes. For Vmux devices, the values are in seconds. A zero value specifies no time limitation. When the test isn't active, the agent initiates this object to 2 when the duration is needed and to 0 if its not required. The user should set this parameter after setting the 'prtSTstCmd' parameter.