This value is the EIGRP retransmission timer for a specific peer -- the time the router waits, based on tracked round-trip acknowledgement history, before resending a reliable packet that peer has not acknowledged. A rising RTO for one peer signals that link is getting slower or lossier than the router's other EIGRP neighbors, which can delay convergence when routes through that peer change. For example, an RTO of 200 ms on a satellite-backed WAN peer versus 20 ms on a local peer directly reflects the extra latency the router must tolerate before triggering a resend.