I've manually changed the home page Facebook open graph preview image, but when I paste the home page URL in Facebook, it still uses an old image.
How long before Facebook updates its cache / uses the updated open graph preview image?
Facebook – How long does Facebook cache opengraph page preview images for
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Best Answer
Facebook automatically clears the cache every 24 hours: Actually Facebook scrapes the pages and updates the cache every 24 hours.
https://developers.facebook.com/docs/plugins/faqs
The above is the link where you can see this.