The background checks can take a very very long time. It all depends. Sometimes it seems like USCIS is intentionally stalling your application using the background check. Though thtat usually only happens if you are Muslim (http://www.scribd.com/document_downloads/161849063?extension=pdf&from=embed&source=embed).
If you don't hear anything in a few months then you may wish to inquire as to what is taking so long.
Sometimes they are much faster. There is no hard and fast rule here.
This response does not constitute legal advice or the establishment of an attorney-client relationship. I recommend you meet with an attorney.
There is no time frame for background checks. If the I-90 replacement of the greencard application is over the processing time, then you can ask to set up an inquiry status check. If it is not over the processing time you cannot do this. If it is over the processing time listed on the USCIS.gov site, then call back and insist on and inquiry.
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Probably at least several months. Nobody but USCIS could tell you for sure.
This advice does not form an attorney-client relationship and is merely informative. It should not by itself be relied upon to address a legal concern.
I am aware of cases where the checks lasted for up to five years in some instances.
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