So I have come home from University for Christmas, But I forgot my authenticator for WoW >.>

So I was going to phone Blizzard and have then remove the authenticator from the account.

but..

I have heard that it can take 3 days, and that they ask you loads of questions to confirm,

I have also heard that its instant, they ask a few questions and for your secret answer and its done instantly...

I want confirmation because I can't be arsed ringing if its going to take 3+days.

Thank you in advance
I put /Lost so it would apply to people who lost it.

I on the other hand have just FORGOT it. I'll get it back when I go back home in a week but I want to know will it be instant?