A typical time is within 7 days. Although, with prior setup... you may be it indexed within hours (some people have figured it out pretty well) Although, No one can predict that how long it will take a blog to get indexed. It depends on how you are promoting your blogs on SEs. If your blog have good Sitemap and all the search engine friendly attributes... It makes crawling and indexing fast.
I honestly cannot remember how long did it take to crawl my sites at the first time. But as what I now right now, it usually takes 2 to 4 weeks for Google to index your site.
Last site I got indexed in 2 days. Make some good backlinks and ping everything. www.pingler.com works well for that.
Are you spreading your links on Facebook/twitter? Or submitting to directories? That's a great way to get indexed fast.
This is based on my fresh website. A fresh website will be indexed by Google in as early as 2 weeks as long as the site will not do any SEO on the start (Social Bookmarking, Article Submissions etc...). But if the site is being optimized right from the first day, Google will hold that site from indexing for up to 60 days. Tested it on my 5 Blogs
Well, why don't you build links? It'll take a few days to build some quality links - and then you get indexed faster.
m new to blogging world... i dono to about link building.... how to start it? any useful article about it... any tools? pls tell