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.: O( l$ B6 q2 Q4 d3 V i' U n7 v
9 ]6 o2 s/ b6 |. m# x/ m& l, ^
Submit your application to Detroit through FedEx, my experiences, normally 10 business days.