What is the expected timg for shipping from Beijing china to CA USA?

I bought an i pod on dec 27,10 and it was shipped out on dec 28,10 but it is still at its original post preparing to post. It was sent through usps registerd mail the tracking number is rr901145624cn... I'm starting to worry.. what is the expected timg for shipping from beijing china to CA usa..... Any help would be good thank u