This reports the maximum lifetime, in seconds, that a TWAMP control TCP session is allowed to remain open before this device tears it down, acting as a safeguard against stale or abandoned control connections consuming session resources indefinitely. An admin running very long-duration TWAMP measurement campaigns needs to ensure this timeout is set high enough, up to the maximum of 86400 seconds (24 hours), to outlast the intended test, or the control session will be forcibly closed mid-test. For example, a 12-hour continuous latency-monitoring test would need this timeout set well above 43200 seconds to avoid being cut off partway through.