How long does it take to send a large number of postcards from Zunyi, Guizhou to Shunde, Guangdong? Will postcards be sealed with letters?

if the address is ok, it can generally be received. The official time is: 3 to 7 days between provincial capitals, 5 to 9 days between provincial capitals and county-level cities, and 8 to 15 days between county-level cities. There is no single number inquiry for ordinary mail, and the post office is not responsible for the loss. Generally, the loss occurs in the last mile.