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. ( }# A z: A- G; S- N. N/ x, [% D6 Z0 l. P3 l) ]+ p* l8 i0 b9 d' O
Submit your application to Detroit through FedEx, my experiences, normally 10 business days.