As of October 1, 2013, more than 10 years for a priority date to become current for a sibling of a USC.
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Depending on your country of birth, it will take anywhere from 10-14 years.
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Please familiarize yourself with the visa bulletin.
The answer provided is general in nature and should not be construed as legal advice as not all facts are know by the attorney, nor does the answering of this question create an attorney client relationship.