How long does SEO take to work?

You can see visibility growing almost straight away. Once content is published you'll get impressions, and maybe clicks within a day if you nailed the content and intent and your site already has decent engagement signals from other channels.

For real revenue growth, though, expect three to six months for measurable movement, and six to twelve before SEO meaningfully changes revenue. Low-competition local keywords can move fast; competitive niches like legal take a year or more. A brand-new domain is usually slower. Google needs time to trust it. SEO compounds, so month nine looks nothing like month three. My take: it depends on the existing website situation, how fast the foundations get fixed, and how competitive your keywords are.