No one except G-d knows how long it is going to take. Even the consulate officials may not know that. The reasons may very from as simple as discrepancies in names to more complex issued found in the submissions to security considerations.
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Most administrative processing is resolved within 60 days. How long it takes could depend on the reasons for administrative processing. If 60 days comes and you still have no answer, I would hire an attorney to start making inquiries for you.
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