The amount of time, in seconds, a user is allowed to spend authenticating to the FTP server. Possible values range from 0 to 65335. Setting this to 0 means that an unlimited amount of time can be spent authenticating.
The maximum number of seconds a client can remain connected without receiving any data on either the control or data connection. Possible values range from 0 to 65335. Setting this to 0 disables the idle timer, and therefore a connection will never time out.
The maximum number of seconds a connection between the server and client can exist after the client has successfully authenticated. Setting this to 0 allows sessions to last indefinitely, and is the default. Possible values range from 0 to 65335.