I wouldn't be alarmed because you've received the receipt notice, so the case is moving. Normally a month isn't very long to wait in the world of USCIS anyways. It will probably come any day. Nevertheless, I just checked three active I-751 applications at random out of curiosity for you. All three biometrics appointments were made within two weeks of receiving the receipt notice. (They are all California cases, which can make a difference.) I'd probably give it a few more weeks and then make an infopass appointment if it hasn't arrived.
Each office is different but several weeks does not seem out of the ordinary.
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It's normal to take 30 - 90 days, sometimes even longer.
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A couple of weeks to a couple of months.
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You should be ok, as long as you have the receipt.
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