File size

[Potatoman]

If a radio station broadcasted at 20K BITS per second, how much data would transfer over 1 hour?

[stevie21]

The amount that you've mentioned multiplied by 60 and then by 60 again.

[QmunkE]

20KBPS = 2.5 kiloBYTES per second

9000 kbytes per second or just under 9 megabytes

[chrisbailey]

Multiplied of course by the number of people listening to that stream.

[stevie21]

Chris, stream broadcasts work differently from navigating to a website and sending a request to the server for "index.html". In that example, if 5 people visit then the server sends that same file 5 times.

Streams are generally broadcast to a specific range of IP addresses which are set aside for that type of thing and having just had a quick glance via google, streams involve sending ONE stream of data to a group of routers which then forward copies of it to lots of end users.
Search google for "multicast" if you're really that interested.