What kind of bandwidth would I need?

[sWiZzLe]

Last night i came across this stream of a Velvet Revolver concert.

The picture and sound quality are superb viewed in fullscreen. Using Netlimiter i found that it need between 80-90k to stream efficiently.
The concert is around an hour and a half and I assume it would be encoded as a wmv file - How large is this file likely to be?

So what im wondering was, what kind of bandwidth would be need to offer this concert to millions of people at once..... or if that's a bit extreme, thousands?

Thanks