esaProbeScheduleGroupDuration is a read-create Unsigned32 giving the run duration in seconds for the group, where the special value 4294967295 means FOREVER, and that FOREVER value is only allowed with a one-shot schedule type. An administrator sets a finite duration for a bounded diagnostic run and FOREVER for a one-shot probe meant to run indefinitely once started. For example, an administrator troubleshooting an intermittent fault sets this to 3600 seconds on a one-shot group so the probes automatically stop generating test traffic after an hour without needing to be manually turned off.