One of my most loyal Irregulars just found the 2004 Sprint voicemail information. At the time, you could not leave a voicemail longer than two minutes on a basic plan, which is what Maura appears to have had. We know from other calls that Maura's voice greeting was not a full minute long (the longest you can have at the time). Which means the greeting and message could not have taken longer than 3 minutes. However, If the voice greeting and message combined lasted longer than two minutes, Sprint could have counted it as 3 minutes. It's possible this was a long voicemail.