Keeping up with writing blogs

I was just thinking about how some people are able to keep up with writing a blog entry every single day, how some people post regularly and others post maybe once in a while. I find that sometimes I feel obligated to write on the blog every day, but sometimes I am so busy I won't have time to write.

But writing takes time, and sometimes you can't always keep writing on blogs, then you won't have time to work on your research.

So, in a sense, blogging can be seen as a disruptive activity, you blog about something, perhaps during your downtime, if you're bored, or taking a break. Then, afterwards, you resume your normal activities of research or work or whatever.

How do bloggers handle this? How much time do you usually spend on blogging, and do you make this a regular activity, just like reading and writing e-mail or instant messaging?