how long does it usually take after the interview

[Keyser Soze]

emailing them was a horrible idea, you should have called. you need to be more aggressive and follow what gonzo has said in this thread already. i don't think you sincerely want this job otherwise you'd be making more of an effort, either that or you just have a passive aggressive personality where you only approach things with assertiveness behind the security of non-human interaction (message boards, email, etc...)