I received an interview invite about 3 weeks ago. I meant to post but forgot. Bay Area applicant, turned in about a week and a half before the deadline. I had to delay my interview until December because of work reasons. When I first received my invite, it looked like there were very limited interview slots. I checked back a week or so later and more slots were released, so I'm thinking they release new slots every few days or so when they send out invites.