Hi @emm888,
Thanks for reaching out. Happy to help you with this!
To update your Facebook shop, Facebook will reach out to your site once per hour to grab your feed file and update your shop based on the latest updates to your WooCommerce store. For this reason, we’ve set the default to 15 minutes to regenerate the feed file, as this provides enough time to successfully update all product data and make sure that it is ready when Facebook comes looking for it.
Would you please tell me a little bit more about what you are wanting to do here? Are you wanting to increase or decrease the interval?
Thanks!
Marcus
SkyVerge