How often does the google bot crawl your site ?

I think on average the normal site gets crawled a couple of times a month but larger sites like digg etc get crawled loads of times a day , how do you know when its time for google to crawl your site more ?

On my main forum - google is on it all the time. I can post a new forum thread and within minutes its already indexed with google. But this forum is almost 4 years old and has thousands of backlinks.

On my new forums, google might index a new thread every 24+ hours. These sites have only been opened about 1 1/2 years.

Google’s spiders crawl the web on a regular basis to rebuild their index. Crawls are based on a number of factors, including Page rank, links to a page, and a web site’s structure. This is just a small list. There are a variety of factors that can affect the crawl frequency of individual sites.

it depends on allot of factors ,there are low PR sites crawled quick by google, also how quick and often you update your website with contents , google sits for long time on high PR sites

Crawls are based on a number of factors, including Page rank, links to a page, and a web site’s structure, and ofcourse then there is google dance don't be freaked out just a part of the game.

Bots can will crawl a site every time it has a new content or post and every time that a particular keyword will search in a single querrie because it will look for the relevant site for that particular searches. Spiders usually read a site horizontally from left to right and from top to bottom so every time bots find a keyword or a link the bots will run into it. So its better to have a good structural linking for your site.

We can't predict the no. of times the bots crawl our site. Its depends on several factors. Whenever the sites in which you have your links get crawled, your link also can get crawled.

Google crawls pages, not whole sites in one go. My sites get crawled daily - use Webmaster Tools to check googlebot activity

Google crawling depends on Page Rank, links to a page, and crawling constraints such as the number of parameters in a URL. etc.. Google crawls famous site like Digg several times a day...

Well said, It depends on a lot of factors. The factors mentioned are main things. Also it depends if its a blog site. A blog is crawled much quickly along with book marking sites.

There is no real schedule when Google release it's slaves and crawl your website's pages.