While creating a COVID-Meter Survey you will be able to adjust many configurations including the Appearance Settings of the Survey.
Here are the definitions for each field under the Appearance Section:

The number ‘14’ above indicates the time period of the COVID-Meter survey. In a period, a user only sees the survey once. (If s/he does not click "ask me later" or leave the survey unanswered). After submitting a survey response, a user will not see the COVID-Meter survey again for 14 days, which can also be edited. After 14 days, the COVID-Meter survey will be shown again to get another response.

The number '5' indicates how many page visits required for a user to see the survey. If it is ‘5’, the nps will be shown during the first page view. The default value is ‘5’ in order not to bother users. 

Sometimes users want to answer the survey later. If they postpone the survey, after that amount of days (2), the survey will be shown again.

Check out this article for more Info:

How COVID-Metter keeps track of the responses and where are they located?

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