The answer to your first question is: no one really knows. Since a visa is not immediately available for your category, USCIS could theoretically take years to approve the petition. Right now, the Vermont Service Center is processing I-130 petitions for brothers and sisters of U.S. citizens from December, 2010. The answer to your second question is: it depends on what you submitted. If USCIS is missing or needs more information, they will send you a request for evidence. Make sure you keep USCIS updated with any change in address. It might also be a good idea to create an account at uscis.gov so you can receive email notifications about things happening with your petition. That way, if something gets lost in the mail, or if you move, you will still receive an email notification from USCIS. Good luck.
Estimated processing times are always as posted on the USCIS website.
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I agree with my colleague. It can take anywhere from 3 months to years.
In terms of the Request Further Evidence letter, depends on how satisfied the USCIS officers are with your submitted documents. If they feel they were enough to prove your citizenship and relationship with your siblings, they will not send RFE letters.
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