duration - Property in wmi

List of namespaces with duration property

NameSpace	n of Classes
ROOT\Microsoft\SqlServer\ServerEvents\MSSQLSERVER	12
ROOT\Microsoft\Windows\TaskScheduler	1
ROOT\virtualization\v2	4
ROOT\WebAdministration	2
ROOT\WebAdministration\MS_409	2
ROOT\WMI	46
ROOT\WMI\ms_409	1