Hi Wilson and all,
I've just started downloading large blocks for the first time tonight. I started with 175 messages. For the particular group I was downloading, this turned out to be 3.48 MB (20kB/msg). I recorded this with "DU Meter" a utility that displays a horizontal-scroll bar graph of upload/download rate and also has a built-in upload/download stopwatch.
To test your theory that the Yahoo limit is bandwidth-based, others should post examples of how many bytes and messages they transfer without pausing. Or better yet, how many bytes had been transferred when they hit the limit and get kicked.
Is anyone aware of another program for monitoring download rate and volume? Unfortunately, DU Meter must be purchased. As and aside, I considered checking the pgo's database (.mdb) file before and after the download, but on second thought, I have no idea how closely the record size compares to the number of bytes downloaded. Retransmitted bytes, IP overhead, etc, must also be considered. A download monitor seems like the only way to do this with any accuracy (hint, hint!)
David Butler