This is the hold time, in seconds, this tunnel waits after recovering from a fault before automatically reverting back to being the active path in its tunnel group, assuming reversion is enabled. An admin sets this high enough to avoid flapping traffic back and forth if the primary path is intermittently unstable (link flapping) rather than fully recovered. For example, a reversion timeout of 300 seconds means the primary tunnel must stay continuously healthy for a full five minutes after recovery before traffic reverts to it, filtering out a flapping link that recovers and fails repeatedly within that window.