There is no such thing as average as each AOS case is reviewed on its merits and creates its particular timelines. For instance, if any evidentiary support or bona fides are incomplete, the USCIS will review and may ask for additional clarifications or submissions, thus making the case delayed longer.
Your may use the listed toll free number within the USCIS correspondence received to request an update.
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It could be 4-6 months.
[This answer is for general purposes only; it does not constitute advice and does not establish an attorney-client relationship.]
Keep waiting ... it will probably be early next year.
But, by now you should have gotten an EAD ... or will soon.
Thus, other that you wanting to get it 'overwith' there is no reason to rush to an interview.
In fact, it is usually in your best interests .. you now have more time to accumulate joint bank statements, bills, etc.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship. Also, keep in mind that this is an INTERNET BLOG. You should not rely on anything you read here to make decisions which impact on your life. Meet with an attorney, via Skype, or in person, to obtain competent personal and professional guidance.
Simple cases should take 6 months or less. Please see
Mr. Shusterman is a former INS Trial Attorney (1976-82) with over 35 years of immigration experience. His response to your question is general in nature, as not all the facts are known to him. You should retain an attorney experienced in immigration law to review all the facts in your case in order to receive advice specific to your case. Mr. Shusterman's statement above does not create an attorney/client relationship.