The time when the post office sends the parcel.

Generally speaking, there are three kinds of parcels in the post office: one is a green form, called "ordinary parcel", which takes about 7 to 15 days; Another is to fill out a yellow form called "express parcel", which takes about 5 to 7 days (usually you send a parcel to the post office, unless otherwise specified, they all give this form); Another is EMS, which can arrive in 2 to 3 days.

There is a certain relationship between the speed of mailing packages and whether the location of the receiving place is easy to find. Generally, it will take time to send it to a more distant address, but it can basically be delivered.

What's more, some post offices notify the recipients to pick up the parcels in the form of notices. Such a small list is sometimes forgotten or lost by the people in the property mailroom. When the post office can't wait for someone to pick up the parcel within the specified time, the parcel will be sent back to its original place.

In addition, Mid-Autumn Festival and Spring Festival are the peak seasons for mailing parcels, which will also cause time delays.