You can modify your ring duration to between 0-60 seconds. You can access this feature by logging into your CONNECT account at http://www.nettalkconnect.com/login
Once logged in you will need to manage the device you wish to make changes too:
This will take you to your Dashboard page where you will be able to see details on the status of your device as well as the ability to modify your Ring Duration.
To modify just slide the meter to the desired ring duration and click save. Changes should apply within 5 minutes.