The Xserver has three options which controls the maximum lifetime of ThinLinc sessions. These are described below, and can be added to the parameter /vsmagent/xserver_args.
-MaxDisconnectionTime s
Terminate when no client has been connected for s seconds. Note: Never use a value smaller than 60.
-MaxConnectionTime s
Terminate when a client has been connected for s seconds
-MaxIdleTime s
Terminate after s seconds of user inactivity. Note: Never use a value smaller than 60.