limit length of voicemail messages

Hey there. @fireguy_6364 is correct that you can change the number of rings that happen before the call goes to voicemail. Once the call is sent to voicemail, though, you cannot control how long it stays there before it ends. My experience is that the voicemail system will end the recording if it does not hear anything for 30 seconds. It sounds like the people leaving you a message might still have some other conversations or background noise that causes the recording to keep going. Unfortunately, this is one that you would have to let the person leaving the message know so they can try to hang up when they are finished with their message.