It will take about six months.
Elkhalil Law Firm, LLC
Disclaimer: This answer is for informational and educational use only. This answer does not create attorney-client relationship. For more details, I recommend a private consultation with an immigration lawyer.
4 to 6 months
(213) 394-4554 x0 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.
I agree with my colleagues. Once you apply you should check processing times by going to USCIS.gov. If you find that your case is outside processing times it may be necessary to do an involved appointment at the Chicago USCIS office. In general, it takes around 6 months if there are no issues in the case.
Dhenu Savla, Esq
About a year, although some people will promise you to get your fiance here in 30 days, it's not possible.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.