How many days does it take to form a new habit?

I follow several blogs daily and I find my self getting frustrated when they have not put up a new post in a couple of days. In all my frustration with their lack of posting, I completely forgot that I have a blog that needs attention. Now I must say that I don't think I have people waiting for me to post, but it did remind me to write! I do have two posts that I have yet to post. Today I am going to play catch up. Enjoy!