This read-only TimeTicks value, though its source description is empty, reports the time since the last meshCostChange event, paralleling the role stTopChangeTime plays for LAN topology changes. An administrator uses it together with meshCostChangeCount to confirm how recently the mesh link's cost actually shifted. For example, the admin sees a small meshCostChangeTime right after noticing meshCostChangeCount jumped, confirming the two figures reflect the same recent event.