This read-only value records, in hundredths of a second since the AP's own startup, the last time this client was authenticated, noting that a session can be authenticated multiple times over its life. An admin can use it to see how recently a given client last completed authentication, which helps when investigating repeated reauthentication or dropped-connection issues. For example, comparing apWStationSessionLastAuthenticatedTime across repeated polls for one client would reveal if that device is reauthenticating unusually often.