Interview coming up - any tips?

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Dear Cordelia,
congrats!
Two days ago, May 16th, I have received the notice BY EMAIL that my interview as been scheduled and that the date will be mailed to me. I am wodnering when will I receive the information with the DATE because I have planned a trip back to my country finally on 14th of JUNE.
In your experience how long didi it take from the notice "we have scheduled your interview" to receiving the notice with the date?
Many thanks

It took me 6 days to receive the letter notice with the interview date after I got the email saying "we have scheduled your interview". Once I opened the letter, interview was scheduled almost exactly a month away from the date I received the letter.