TechnicalUser2222,
You have touched on a very extensive subject area - for the Aria platform. Because there are so many different types of messages and depending upon how the message arrives into the Aria mbx, the length of each type of message greatly varies. Thus, there can be no correlation, such as number of seconds to number of bytes for a message - on the Aria platform.
I had to trace out a voice message some time ago and it was not very pretty - took several days to go byte by byte through the message and sometimes nibble by nibble.
Pat