This read-write Integer32, ranging 0 to 259200 seconds (up to 72 hours), specifies how long the BERT run should last, per its description, after which BERT is automatically stopped. An administrator sets this to bound a test's duration so it doesn't run indefinitely and consume test resources or bandwidth longer than intended. For example, an operator running an overnight soak test might set bertControlDuration to 86400 (24 hours) so the test halts itself the next morning without manual intervention.