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. s0 ?* ]7 O$ M) \/ l- m0 Q5 ]" q, e
Submit your application to Detroit through FedEx, my experiences, normally 10 business days.
My experiences: 5-10 business days (Several cases)$ ~7 J5 V* w E( ^0 X9 M- w- c
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right place, right way, right documents