What is the timeline/timeframe for a DS-230 I & II visa application?

My wife is in china applying for an immigrant Visa with form DS-230. How long does it usually take to take an interview. Our attorney stated 6 months. However, when checking online I'm getting 2 to 3 weeks sometimes a month or so??
Answers:   
Well my sister who was in Jamaica send surrounded by her DS-230 and received her interview 9 months later.
Well visit the governments immigration website of the country surrounded by which the Visa is being processed. They will have your answers, remember Lawyers like time and money.

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