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Why don't you set your ringtone to "Bell' then use a different phone to call yourself and count how many times it rings?
 
It is carrier determined. I want to say I timed it 22-23 sec for AT&T. It has been a long time since I did it.
 
Does anyone know if those instructions work for At&t or whats the procedure to change it on At&t?
 
Ok, so found it... At&t lets you set the max time before going to voicemail to be 30 sec. I works now. Thought I'll post it so that it'll help others...
 
Dont have to call Att for this. Just followed the instructions in the link above. Max time you can set on Att is 30 sec, thats it...
 
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