ATR,
I made the initial contact at a job fair in MIA end of Jan. Then a few emails back and forth, I got a call from one of their Captains saying that he liked my resume. There then followed more emails (I was out of the country at the time) and more recently, HR emailed and called to offer an interview. So, I would say about 6 weeks. I think they only recently fixed up the actual dates for interviews as in Jan it was "accepting resumes for possible spring interviews".
I would suggest that you keep a dialogue going - both email and telephone contact. Don't be too pushy and don't mention that you would ONLY consider the Polar side. Leave that until the interview or if and when you get an offer.
If you want any more info, feel free to PM me.