This reports how many minutes have passed since the last notification that Ethernet port 4's utilization exceeded its configured watermark threshold. Admins use it, carried in traps, to gauge how recently and how persistently port 4 has been running above its utilization alarm threshold. A locEthWtmkHitDurationETH4 value near 0 tells the admin port 4 crossed its watermark very recently, while a high value indicates a longer-standing overutilization condition.