I’ve changed my site title and description 3 days back but still the old one appears. Is it because of google crawl? How long does google take to crawl?
Yes, most likely Googlebot has simply not crawled your website since you’ve made the change. Do you use Google Webmaster Tools? If so, you’ll be able to see the crawl stats for your website. Have you submitted an XML sitemap to Google? If not, this should be located in the document root of your website and be named sitemap.xml.
Google isn’t going to let you manually increase the frequency of it’s crawl to your website. However, you could, manually reduce the frequency of the crawl through Google Webmaster Tools if you felt that Googlebot was sucking up too much bandwidth too often. Google will increase the crawl rate of your site based on many factors, but mainly the frequency of new content and traffic. If you post your new pages to Facebook or Twitter you’ll probably have Google crawling faster than if you don’t. If you have 10k unique visitors daily, you’re going to have your pages crawled more often than if you have 100 unique visitors daily. Get the idea?
Unfortunately, there is no definitive answer to your question. Just need to play with some variables and give Google a reason to come back on a more frequent basis.
Just thanks for the information mate!
you can add Google +1 button, than login into some different account and click (sure you should came there from google serp using google chrome), this can help.
I’m not sure that answers the OP’s question in any way. It also sounds to me like an abuse of Google +1, but perhaps I’ve misunderstood you.
First, it doesn’t answer the question at all… second, that’s spam 
We’re honest fellows so I’d personally stick to the professional and honest way… and I will stick with what Jeff said
For regular crawl of your site required to made changes in your site at regular interval.
hi, friend
use Google web master tool to know about crawling, crawling is fast when you keep on updating with new content to your blogs.
thanks
Hi friend,
Every one face this problem… Ones Google Crawl your website then it will show your new Meta in it listing …
Submit your URL into Google website and webmaster tool again( It is safe process)
Ones i found that Google store your new meta in its data after crawl your website but never show it immediately in the listing …
Just Wait and Watch…
Now a days google is not crawling daily, google is not indexing google sites also. So we don’t know how their crawling algorithm works.
Try to change the priorities for xml sitemap. Or you can also try pinging your website with blogsearch.google.com/ping. Hope this solves your problem.
Do you have any reference for that? I’ve not seen any evidence that Google is not crawling its own sites.
Now a days google is not crawling daily, google is not indexing google sites also. So we don’t know how their crawling algorithm works.
On the contrary, we know that Google is crawling it’s own sites because the content shows up in the search results. The next time you see a search result for a posting on Google Groups or their own help documentation or maybe Gmail, you know that they are crawling and indexing their own sites. Why wouldn’t they? As long as they’re not giving their own sites preferential treatment in the SERP, then there’s nothing wrong with it.
There are good sites where you post some content it will get cached quickly and even you will receive google alert message of that post. So as per my understanding there is no such definite timeline to get crawl by google but one thing i believe if you provide value to your site and users get benefit those kind a site get cached quicly. Like other suggest just place in webmaster tool the links and check how its coming. Also feed submission is another effective way to me to get cached.