How long does google take to show the results in SERP once the pages are indexed?

There seems to be no fixed time for this to happen. Getting Google to crawl your page and to index it is pretty easy to do by making a request in Google Search Console.

My experiments have shown that this can happen within 24 hours but it could take much longer. When you submit a request for a page to be indexed in GSC it is also easy to check that it has been indexed by making another URL inspection.

A further observation is that a page submitted in sitemap but not specifically requested to the indexed was reported as being included in the Google index but did not appear in a SERP when a non-ambiguous query was made. In this case there seemed to be a positive correlation between the request for indexing and the inclusion in a SERP. I cannot be sure that this is the case.

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How long does google take to show the results in SERP once the pages are indexed?