How long does it take to get a work permit after Biometrics , Just got my interview appt?

I send my papers in at the end of january I got my biometrics appt on march 15 2011 and I just got my interview appt date But im still waiting for the work permit which I was told I will get before the interview date ?`I know the letter I received said between 30 to 90 days but I just got an offer for a very good job and Cant take it without this permit . any idea on how long is taking these days for the work permit to arrive??? Thanks