You can also call VZW and they can extend your ring time. It's done by seconds, so they will ask if you will want to extend your default ring time by X number seconds. Whatever you want. It does sound like you need a new ringtone if it is slow enough to only ring once.
Do you have it set to Ring then Vibrate? 5.0 gives you an option to Ring and Vibrate at the same time, reducing the time between rings.
