While on page optimization can usually produce the fastest results in SEO sometimes it can take a little while to see results. Typically, if changes will have an effect, it can often take between 10 and 21 days. If your page is brand new, expect results to take even longer.
It is best to measure the time in SEO by Google cache dates. Google cache is a picture that Google takes of your website. Google gives you the time and date of each cache. To see the date, simply put cache: in front of your url and click to search. If your page was www.yoursite.com/your-page you would write into Google: cache: www.yoursite.com/your-page
You will see the cache date at the top of the next page and the picture of your page that Google took. The 10 to 21 day estimate begins with the first cache date after the changes to your page have been made.