How many days will it take for the letter to arrive in Xicheng District, Beijing?

It usually takes one day to arrive.

If you send a letter to the same city before 9 a.m., you will usually receive it on the same day. Because if you want to receive letters sent to the same city on the same day, you must arrive before sorting and delivery. If it is sent after the sorting and delivery time, the letter will only be delivered the next day. Generally no later than the next day. If there are other circumstances, it will be a different matter.

When sending a letter, be sure to clearly write down the recipient's address, recipient's phone number, recipient's name, etc. If anything is not written clearly, the mail will not be sent to its destination. When writing a postal letter, pay attention to sealing it after writing, because the courier has no right to touch the sender's belongings, so you need to handle some small details yourself to avoid failure to send it later.