Hello. I think you have a fair enough estimate since you were put in line for an interview recently. Processing times are always subject to change and you cannot get as precise an estimate as you are seeking. Last you did not say when you filed your application.
I agree with Attorney Ahmed.
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Processing time estimates are listed on uscis website. None of us knows more than uscis and even they do not really control fully this information as the estimate fluctuate
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