Since there is a lot of different things that go into search engine optimization (SEO), results can vary. Sometimes you can see results in as short as one day or six months to a year. SEO results grow over time and you will see better results as this period goes on. The best digital marketing agency will be able to get you to start seeing results in the first few months with a better results at six months and even better still when you hit a year. To maintain and keep your rankings, it is important to continue some form of a digital marketing campaign; whether it is link building, content creation, et al; that way you will contain growing and maintaining your rankings.