Writing a 1000 article blog will take 4 years

Neither do I (in spite of my being an article marketer). The benefit-potential isn't anywhere near proportional to the work involved. It would be a very poor use of my time.

I assume many people will not be able to write everyday and will miss some days and will not feel like writing somedays. so 100 days will be wasted. so if you are efficient for only 250 days at the end of 4 years you will have a cool blog with 1000 articles.
My point is that even if you are lazy you can create a 1000 articles website or blog within 4 years.

Most people spend 4 years in college to get a Bachelors degree, and 4 year is not a lot of time, so it gives me hope that it is possible for people to create a 1000 page website or blog if they write only 1 article per day and even miss some days.

hehe I think he was just counting Monday - Friday, but I thought the same thing.

There are less than 250 working days in a year.

Blogs like those you mentioned are online for almost 10 years.

I couldn't. One article per day is plenty for me: they must have a different understanding of the word "article" from me, I think. (I suspect that some of them perhaps imagine that it's just a chunk of keyword-optimized text to which a backlink can be attached?)

Nope. That's how hundreds of people start off trying to make money, until gradually they all drop out in disillusionment, only for their places on the web to be re-occupied by another whole new generation of beginning marketers each destined to repeat exactly the same mistakes and misunderstandings as their predecessors, partly because it's what they'd all gleaned from posts in forums. At any given moment, there are tens of thousands of them about, doing exactly that, but very, very few of them are really earning much from it, at all. That's one of the many ways in which the high failure-rate in internet marketing becomes self-perpetuating.

My IM related MMO blog has 2,128 articles on it.

Know what my traffic stats for the site are this year?

Jan 2014 3,212 8,794 24,564 28,699 4.13 GB
Feb 2014 2,011 5,995 21,816 25,223 3.83 GB
Mar 2014 2,445 7,030 17,955 21,324 3.53 GB
Apr 2014 2,859 6,970 20,604 23,090 1.77 GB
May 2014 2,992 7,336 22,894 25,300 1.90 GB
Jun 2014 1,429 3,480 8,080 9,124 412.73 MB

That's it. That's all that 2,128 articles gets me monthly. The first column is unique visitors. Now I know, this isn't awful and if I put some more monetization into the blog itself I could probably do something with it. But after that many articles you'd think I'd get more traffic than this. This is pitiful.

As Alexa said, there are better ways to spend your time.