Hello,
Thank you for contacting Rank Math and bringing your concern to our attention.
Please note that Instant Indexing helps your website’s pages and content be crawled instantly. However, using Instant Indexing does not always result in the indexation of the content, as it may take anywhere from minutes to days or even weeks before a URL is indexed.
It doesn’t guarantee that your pages will show up in the search results, but you can still use it on your website.
Moreover, Google assigns a crawl budget to your website depending on these factors (especially these two) and that has a direct effect on how soon or how late your content can get indexed.
It depends on a lot of factors. Your posting frequency + the domain authority are just two of the many factors Google considers when indexing some new URLs.
Looking forward to helping you.
