Hi! Where is my Parcel I can't track it. here is my tracking no by the way: RR839756150CNRB181561981CN

I just ordered in some china online shopping site , and they said they already shipped it, however i can't track my items. How many days does it takes for us to be able to truck our parcel is it right after the seller shipped the items? or it will take some days?
Thank you,