Used only with -MonitoringContext, sets the frequency that the script will raise further events for a database that has too ...

Used only with -MonitoringContext, sets the frequency that the script will raise further events for a database that has too few healthy copies.  The default is 15 minutes; so if a database has had insufficient healthy copies for 20 minutes, the error event will be raised twice.  This is to avoid having SCOM not raise the alert if the earlier event is missed.