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These are good answers, however if your site has a blog and other content which frequently changes (e.g: you are an eCommerce site and you have hundreds of products that go up and down every day) - there is no point re-submitting your product sitemap(s) every 15mins when one product changes. Let Google just digest that stuff naturally For your posts sitemap (which should be separate and linked in your sitemap index), if you only post once or twice a week - but the posts are high quality and in-depth, then yes - re-submit your post sitemap as needed