The following bandwidht calculator is based on the average time, lets suppose i think my radio station will have 10,000 listeners and each listener should have spent like an hour on the radio and my stream is a 16Kbps, so the results will be:

Bitrate: 16 Kbps
Listener count: 10000
Period: 1 hour
Total Bandwidth: 67.06 GB
Package: Standard

Details: for a radio station that has a 16kbps stream, you can serve up to 10,000 listeners with the standard plan if the average time per listener (per month) is 1 hour.