As of October 1, 2013, more than 10 years for a priority date to become current for a sibling of a USC.
You may contact the Patel Law Firm at 301-806-6959. This is a general answer and does is not intended as final or legal advice. Please consult an immigration attorney to review the specific facts of your case.
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.