SEO consultant will partner with you to devise a plan that will systematically improve your ranking on the major search engines. Depending on your budget there are strategies that can be implemented that can speed up the process and others that will be as effective but that will require more time. But you are looking at a minimum of 45 days to start seeing any major improve to a maximum of 90 days. But it is a snow ball effect. Once it is started, it picks up momentum. Delegating this process to a professional is a wise thing to do, so that you can dedicate yourself to what you do best which is to provide the product or service and make sure your customers are satisfied.