Dive summary:

• SEO agencies give a vague three-to-six-month estimate on how long it will take to receive SEO results.
• Google search results favor big brands that are able to spend more money.
• It could take months or years of investment in SEO before small businesses to build signals and do well in search.

From the article:

This is very dependent upon how “success” is determined and how “ROI” is defined. It’s not a simple question. And it doesn’t have a simple answer. ...