if it's 'tracked' normally the max is seven days (most places it's 5-days), you can also do special-delivery which guarantees delivery by a set day... normal post is really down to the overseas country you send it to when things get delivered
be sure to mark the parcel as 'fragile'.
You seem to forget the custom there is a pain. I would assume Chinese custom is no different since they are both communist.
Better go with Fedex, UPS, DHL, or ParcelForce (personally I don't like ParcelForce though).
Edited by tranhieu - 9/23/12 at 5:12pm