How long will it take before Google index a newly registered domain?

24 hours 100%

but don't forget to make a sitemap and put it in webmaster tools

 

It is depending on quality your content. mostly with in one week, it will be index your site.

 

I always submit my sites to a few social bookmarking sites and normally am indexed within 24 hours - I use digg and stumpleupon, sometimes propeller.

 

It depends on your online knowledge .

My average is 30 minute for a new domain

 

usually my sites get indexed in 1 week...

 

does domain extension and registrar a factor in indexing website? this is my first .net domain and I'm not sure if this is the reason why Google is very slow to index it.

 

Thanks for all your helps and suggestions. My website now is indexed in Google!

Cheers!