How long a blog post should be?

Well, here is a post which is gonna tell you how long should your blog post be for blogging success...
Thanx for problogger.net for writing this content and I've got this tip from his post and I'm rewriting it!!!!
View this very carefully...

We might as well continue exploring the topic of writing good content with a topic that has been debated by bloggers rather hotly over the years, the length of the optimum post. There are a number of ways of looking at it:

• Reader Attention Span – It is pretty well documented that the typical web reader has a short attention span when it comes to reading content online. 
• SEO – There is a fairly strong opinion among those considered experts in Search Engine Optimization that both extremely short and extremely long web pages are not ranked as highly as pages that are of a reasonable length. Of course no one really knows how many words are ideal – but the general opinion seems to be that a page of at least 250 words are probably a reasonable length. Similarly, many advise keeping pages under 1000 words.
• Quantity of Posts – One theory that goes around is that shorter posts allow you to write more posts and that more posts are better for generating readership with RSS and in Search Engines. While I don’t know their strategy personally, some believe this is what sites like Engadget andGizmodo do with their high number of short posts which make up the majority of their content.
• Topic/Genre - The type of post that you’re writing will often determine it’s length. For example when writing a review of a product you’ll generally write a longer post than when you write a news related post where you link to something someone else has written.
• Comprehensive Coverage of the Topic - Ultimately this has to be the main criteria that bloggers go with. I can’t remember who advised this but at some point in the last year I read someone saying that you should write enough to comprehensively cover your topic and then stop. Long posts for the sake of them are not a wise move – but so are short ones that don’t cover the topic well.