How long does it take Google to recognize keywords?

I think, 'time' depends on the competition. If there is high competition, it takes time to recognize such keywords presented to rank on search engines. Or it may also depend on the lack of optimization on your website. If you haven't optimized your website for quite a long, it may take time to get recognized by Google.

Thanks for sharing useful information for us.

According to SEO experts, it can take three to six months to rank on the first page of Google if you're creating quality content and optimizing your website. However, if you're targeting extremely low-competition keywords, you can rank immediately.