I pretty much blog off and on all day long. It really depends on my mood. If I'm feeling ambitious then I try to write as many posts as I can. It comes in really handy for those days when I don't feel like blogging at all. I also set aside some time every day to visit a few of my favorite blogs.
I recently started blogging in August and I am addicted. I try to comment on others sites in the evenings (after the kids go to bed). Otherwise I feel like I am reducing the mommy time (I too am a working mother), and I feel they get shortchanged enough. My blog comments are as often as possible, and only when I get an idea that I thing is worth writing about.) Do you have a blog? Mine is at http://susanchapmanfobes.blogspot.com.