You need to watch out for bits and bytes. The stream rate are in mega bits per second and the rate caps are in bytes. Typically bytes are 8 bits, but there is overhead for packets, so I conservatively and lazily use 10 to convert to bytes. So a 1.5 Mbps stream for 100 minutes would be 1.5 mbps * 100 min * 60 sec per min / 10 bits per byte would be around 900 MB. I used the lower bit rate for ease of computation. If you used 4.5mbps bit rate, triple the number to about 2.7GB.
Shouldn't it be 8 bits instead of 10 bits. The last time I check. A byte has 8 bits not 10. But I could be wrong.
8 is correct. 10 was often used "in the old days" when calculating the transfer rate over a serial modem, which often included stop and parity bits, commonly bringing the total to 10 bits.... uh oh, I'm showing my age! :p