If I change content on my page, how long to get new ads?

Do I have to do anything to get new ads? How long will they start appearing?

 

If you change content then it has to be a significant change to see different ads. There are certain words that adsense bot has to pick which triggers the type of ads to show.

 

I think that very soon, few refreshes, but if you change your content mostly not just few words.

 

Yep google picks main keyowrds. Here you can read about it: http://www.google.com/services/adsense_tour/page5.html

Oh when content is changed ads change

 

In my experience, it can take several days or a week for ads to change, especially for a new site with no PR.

 

PR doesn't have nothing there.

 

If the page in on blog adsense bot may take 1 day to reflect new ads if it is a site plenty ofother pages with same kind of content , new ads can reflect with in 1 or 2 hours.

 

PR should not affect the crawling since adsense is done by a different search bot