When do the ads update to match the content?

I change content all the time and the ads don't follow

[Bonusbana]

Hi

If I change my text often, like I do on the frontpage, the ads don't follow. I have noticed that the blocks are showing relevant ads to the content that was there yesterday. Every day, there is a new article on the front page, and so the ads are always behind 24hours wich makes them useless.

Does the site need to be crawled before google ads start showing relevant advertising to match the content?

thanks

[steve40]

Bonusbana
I am afraid the adsense mediabot is not the same as gbot and can sometimes be up to 4 days out of date of page even if gbot has spidered ,
One possible way to force mediabot to recrawl is to change something on adsense block e.g. possibly channel each time you update page and switch between 7 channels dedicated to days of the week
This may also provide some help with what articles provide best ppc

just an idea
steve

[Bonusbana]

Thanks steve,

are you saying that if I switch channel, the ads will update automatically? So if I serve different channels every time I update the content, the ads will be more relevant?

thanks again