This read-only Integer32, ranging 800 to 45000 milliseconds, sets how long each unit will wait without hearing from its peer before declaring that peer dead; if the peer that goes silent was the active unit, the standby then takes over. An admin tunes this value to balance fast failover detection against tolerance for brief, harmless communication gaps. Setting this too short on a link with occasional latency spikes could cause an admin to see unnecessary failovers triggered by false peer-dead declarations.