How does Android WeChat set the timing of sending messages?

Android WeChat regularly sends messages as follows:

Mobile phone: Huawei P40

System: emui10.10.

Software: WeChat 7.0. 18

1. Open WeChat and enter the applet on the "Discovery" page.

2. Click the search icon in the upper right corner.

3. Enter the snail book in the search box and click the snail book pro below.

4. Complete the login operation according to the corresponding prompts, and WeChat will authorize the login and allow access to relevant information before fully entering.

5. Locate the home page and click Create.

6. Click "More Settings" below to set the following three settings: signature, content prompt and interactive settings. Click "Save" when you are finished.

7. Select "Send" to finish sending messages regularly.