Visa interview wait times have dropped dramatically in Brazil, and now average just two weeks or less in Brasilia, Recife, and Rio de Janeiro, and 35 days or less in Sao Paulo.

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The U.S. State Department has done "tremendous work" in speeding up the visa process, Freeman said, and posts visa interview wait times on consulate websites.

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In key markets such as China, Consular officers are keeping interview wait times to an average of five days in 2012 while managing a 37 percent increase in visa demand.

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