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. 2 ?- B1 ~' M [0 j( `2 F* y _6 b+ \0 u4 C2 h4 w' I) @% L" W
Submit your application to Detroit through FedEx, my experiences, normally 10 business days.