Once you begin using SEO, how long until you see improvement in your search engine placement?
The amount of time you will have to wait will depend on which techniques are employed in your efforts to optimize your website. Assuming you’ve rebuilt your site and loaded it onto your server, replacing the old files, you need to be prepared to wait anywhere from a few days to a few months.
If your site has already been on the Web for some time, then you will probably begin to see improvements in your search engine rankings within 4-6 weeks, though you may see a temporary boost within a few days.
In the end, a bottom-to-top rebuild of your website will result in an improvement in your search engine rankings rather quickly. You should continue to see improvements for 6-9 months, as the changes to your site are indexed throughout the databases that drive the major search engines.