This is the configured ceiling on the SCTP retransmission timeout, capping how long the protocol will wait before retransmitting even on a severely congested or high-latency path, with 60000ms (one minute) as the recommended default. It bounds how long an SCTP association can appear stuck waiting on an ack before giving up and retrying, which affects how quickly failing associations get detected versus how tolerant the device is of transient long delays. A satellite-linked SCTP association might need this raised well above 60000ms to avoid needlessly retransmitting over links with several hundred milliseconds of inherent one-way delay.