Does anybody know, how long the official acceptance letter has if sent to Europe? I am waiting for more than a month now.

Usually no more than one week. Email to the admission office, they should be able to give you an update about your application. Otherwise try to hurry them up a bit !

Usually no more than one week. Email to the admission office, they should be able to give you an update about your application. Otherwise try to hurry them up a bit !

Perfect :-)

Hope that you got your offer letter by now. I had a similar problem with that since I did not receive the letter by post although they kept saying that they posted it.
Ultimately they concluded that my letter must have got lost in the post and sent me a new letter.
So please check with them since they give only a month to accept the letter.
Even otherwise they could give you a link to accept the offer online before the letter arrives formally.
Hope this helps...