This value reports how long a specific Stormshield service has been running continuously, as a companion column to that service's name and up/down state in the services table. An administrator checks it to spot a service that has recently restarted unexpectedly, since a short uptime on an otherwise-stable service can indicate a crash-and-restart cycle. For instance, an uptime of only 45 seconds on the "sslvpn" row, right after a long prior uptime, would flag a recent unplanned restart.