How many MBs of internet does WOW use?

Hello, folks.

I am a bit slow when it comes to technology, but I recently discovered you could connect to the internet via the mobile internet I get on my mobile phone (a HTC).

I have now successfully connected to the internet, and am able to play WoW at around 40-60ms on both home and world... things.

Then I realized, surely World of Warcraft requires an awful lot of MB of data to play?

I think my contract is 1 GB of internet per month, along with minutes and texts of course, however.

How many hours of WoW playtime, if the playtime even exceeds an hour, would I get off my 1 GB allowance? I raid 25 man three times a week, and just generally play on the game a few hours each day. Can anyone give me some general ideas? I know there will be a massive number of other things that will affect the amount of MB WoW uses, however, someone must have a ballpark figure?

Thanks!

Also, I have posted this on technical forum, but I can't seem to find the post, so I thought I'd post it here too. Again, thanks.