Beta friend Invite system question?

I have a question I was recently invited to PoE beta, but have not recieved a beta friend invite (key) yet and was wondering what I have to do, to get one like get to a certain level or make a number of posts. any feedback would be nice, like how many days after invited to beta it took for you to recieve an invite for a friend just wondering because my brother is yet to be invited and I wanted to surprise him with a key of his own to activate the beta on his account.

I also would like to know the answer to those questions

yes this is a question have not read anything about here. would be cool to know.

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