This sets how long, in milliseconds, this device will wait for a Synthetic Loss Reply before considering that particular SLM probe lost, directly shaping the test's loss measurement; too short a timeout on a high-latency path would misclassify slow-but-eventually-arriving replies as losses, inflating the reported loss ratio. Setting this to 10000 milliseconds rather than the minimum 2000 would be appropriate for a satellite or very long-haul path where round-trip time alone could otherwise exceed a shorter timeout and produce false loss readings.