Board Thread:Questions and Answers/@comment-6744172-20130227143527/@comment-4883034-20130402030013

Moderator: Be here for at least three months, be friendly, liked, show that you can put quality work into chat, be active in chat.

Administrator: Be here for five months (I don't know if there is a time limit for Admins, but this does seem like a good amount of time) Have lots of edits, put quality work into the site, be well liked (how else are you gonna get noticed and supported?), and be active.

I don't believe there is any critera set into stone, but this is sort of the unspoken rules about it, or so it would seem to me. I hope this helped.