You can get an estimate of your expected processing time for your petition by going to https://egov.uscis.gov/cris/Dashboard/CaseStatus.do
On the bottom is a section where you can get an estimated processing time based on what type of petition it is and which Service Center it is pending at.
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The answer below notwithstanding, I would realistically estimate 9-12 months, based on my latest experience with an EB-1 National Interest Waiver case approval.
Estimate processing times are as posted on the USCIS website.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
Processing and adjudication times vary widely. The USCIS provides a processing schedule, but its accuracy is open for debate. 30 days would be incredibly unlikely. You will want to discuss timing with your attorney.