my DH is not alumni and did his interview today. He applied on Wed, got an email friday afternoon to schedule the interview, called yesterday morning to set it up and they called this morning to do the interview.
He applied through the regular WDW jobs site so he didn't see anything there about not applying for more than 3 positions. He applied for a LOT of them but the lady he spoke with this morning said it was fine because they are all related to his experience and his degree. He did pick his top 3 and told her why those were his top picks. His interview went on for around 40mins and she told him he'd hear something back by May at the latest.
I hope this time line helps!