Alright well, I asked someone about this and they said that the last known bandwidth that they checked was 20 kb (kilobits) per second? Though it could be a little more, as the last time they had checked that was when they were in the old Bonfire, but even so, it could have risen a bit due to having the login page. But it's pretty much nothing. You can continue playing without having to worry about using up to your limit per month.
Other than that, people are welcome to correct this, if my statement is slightly incorrect.
Apart from this, I can't really help you any further because of my lack of knowledge in this myself? But the research and asking around was done anyhow.
Sorry for not understanding what you had said first time round.