China Post is the official postal service of China. If you bought something from online marketplace like Aliexpress, Wish, GearBest, Banggood, the sellers often use China Post to ship your orders.
China Post tracking number is a 13-digit tracking code, usually starts with “R”,”LF”,”C”,”U” and ending with “CN”. For example: RX864895238CN.
It depends on the destination an the China Post service you have chosen. Usually it takes 2-4 weeks to arrive to destination country from China.