Can I set a validity period for user passwords
158When AAA local authentication is used, the device does not support validity period setting for local user passwords.
When RADIUS authentication is configured, whether password validity period setting is supported depends on the RADIUS server. Consult the RADIUS server vendor about whether the server supports password validity period setting.
Other related questions:
Method for setting a permanently available password for the administrator of the USG2000&5000 series