Wow I never even realised those were the real words of the song (not american). I always thought I was just hearing some joke version like "jingle bells batman smells" or something.

I'm not sure what the usual wait time is as I understand they are processing invites faster than usual at the moment, but I only had to wait about an hour or so for mine. And I feel like there's some additional psychological effect going on too - like I feel more invested now that I've gone through this process and gotten my invite as opposed to places that you just sign up and that's that.

I saw it mentioned in the comments on post on Hacker News (news.ycombinator.com). There's something quite inviting about the layout here, so I decided to give it a whirl.