Originally Posted by jiejie

From the USA west coast to major Chinese east coast city, generally about 10 days. From east coast or smaller town (i.e SE USA), two weeks. Add more time if going to a Chinese city further inland. This assumes standard air mail, non-express service. All incoming mail is subject to search by Chinese Customs, but for small envelopes that pretty clearly contain only a document, usually are not opened/searched. Usually it is speedier sending outbound intl than receiving inbound intl.