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John Mueller of Google recently discussed this topic... https://www.seroundtable.com/google-higher-page-count-seo-26633.html Amazon has millions and millions of pages.  They can be beaten for commercial queries with a 20 page site.  If your 20 pages are bursting with some of the internet's best information for your topic, and visitors engage your site and ask for it by name, then you can beat Amazon with 20 pages.