It depends on the setting of the publication duration of the site. You will find this information on the detailed site sheet.
This means that the article or links cannot be modified, de-indexed or deleted during the planned publication period.
This information is visible on the detailed site card from the catalog as in the example below.
If the duration is not limited, it will be within the lifetime of the site.
Here you can find more information about our refund policy in case of modification or cancellation of an article after publication: 8.2 Active duration of Sponsored Content