You'd better do it in Canada, just in case you need additional documents and you can't get them right away if you apply for visa in China.+ i2 w% C( w: X* h. u* j# e
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Submit your application to Detroit through FedEx, my experiences, normally 10 business days.
My experiences: 5-10 business days (Several cases)! q; P" h8 S: {# c: |! P( N& T) f$ D
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right place, right way, right documents