Longer ringtones and rings

I have a motorola i880 through nextel. I have finally learned to make and uploaded my own ringers with webjal. I have two questions for anyone who may have answers. My phone rings 5 times before stopping. Is there a way to increase this to like 8 rings?

Also, ringers play for about 15 to 20 seconds, is there some way to make them play longer because I would like them to play for around 30 to 40 seconds even?

Thankz so much for any responses.

I think you can call Nextel to change the ringer times.
As far as the length, rule of thumb is make you custom ringtone 26 sec max.