I was wondering if Google indexes the blogspot blogs automatically without we submitting it in usual way as we do for a generic website?
My experience with blogspot and Google are not too favorable. I built 5 or 6 blogspot blogs and it took over a month to get indexed. I didn't post everyday though but anyway I just setup a Wordpress blog and posted 2 articles and it got indexed in 2 days.
If you build a couple of backlinks it will speed up the process. Otherwise you can wait even a few weeks to get indexed.
There is an option in the Settings to allow you blog to appear in search results. I think it is on by default which probably means your blog will get indexed automatically.
Google index blogspot blogs really fast. If you want to make things more faster, then get some backlinks from high PR pages.