How long does it take for a site to get indexed?

It depends on your process you're applying. I used to bookmark my sites on some of the selective social sites and share the updates and it get indexed within 7 days.

But by building links on the website which have fresh content, you have more chance to crawl your website.Don't you think so?

Hi
With link building in high page rank websites, you have great chance to be indexed sooner.

6-8 weeks is too long for your website to get indexed in Google and other search engines. Your webpages can be indexed in a day if the search engine sees your content relevant and unique. If you are using CMS platforms like Wordpress and Blogger, you don't need to use ping websites like pingler and pingoat because these blogging platforms already have a built-in ping service.

I think near about 2 month.

Search engines do not reject websites as long as you are not violating any of their guidelines. And, indexing time depends upon your website's visibility. I have seen many websites getting indexed in 24 hours...

And, after the launch of fetch as Googlebot tool, it has become easier to get your websites indexed.

It depends upon how much quality effort you deliver to index your website fast.There are many techniques which can help us to index our website fast .Quality content and sitemap submission are some of them.

It all depends on the webmaster, if he or she knows what are doing and they create a full sitemap and all other things then it should not take more then 2 weeks if you have a big site.

First of all, the Google Sitemaps Program is by no means a free ticket to Google's search index. It helps Google to discover new resources, and it leads Google's crawlers to updates faster than ever before, but it does not guarantee crawling or indexing. If Google refuses to crawl and/or index a Web page during the regular crawling process, a sitemap submission will not change this fully automated decision. Regardless how Google gets alerted on a URL, be it via sitemap submission or by following links on the Web, the same rules apply. That goes for spam filters, duplicate content handling, ignoring not promoted sites, etc. etc. - Googlebot does not eat unpopular spider food.

A new Web site is considered unpopular, because it lacks link popularity. That is if no other page on the Web donates a link to a new page, Google usually will not index it. Googlebot may fetch it every once in a while, but it will not be visible on the SERPs. This makes sound sense. First, if nobody except of the site owner considers the site's content important enough to link to it, why should it be important enough to debut on the Web via Google's search results? Second, caused by an overwhelming amount of spam Google has to deal with, many (not all!) new sites will not be placed on the SERPs during a probation period, which can last 6 months, a year, or even longer. This probation period is also known as sandbox, the only escape is reputation. A Web site can gain reputation, when it receives well formed natural links from trusted resources.