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The main thread checks if all of the child processes did finish their processing within the thread completion timeout by checking the status of all child threads was set to Completed. The main thread will finish with error if timeout was reached. The value of the thread completion timeout is set in }APQ Settings and its default value is 3600 seconds.
Polling of completed status is provided in interval that can be configured in }APQ Settings, the interval value is shared with Thread Initiation Polling.