I am not sure why you should be worried. Come back to USCIS in a month on an infopass if you get no decision by then.
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Either your case was approved or it was not. There is no such thing as a "supervisor hold" after approval.
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I am guessing that what the officer meant is that he /she is approving the case, but it has to be rubber stamped by the supervisor. As Mr. Segal suggested, you can follow up after 30 days. And consider hiring an experienced attorney to help you.
Your file may have been pulled for further administrative review, or it may be that the officer who interviewed you is simply waiting for his or her supervisor to give the OK. Either way, all you can do is wait. If more than 30 days pass, I suggest you make an InfoPass appointment at that Field Office to see what is going on..
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