There was a pretty good take on the Vigorous Writing blog (which apparently, as of 11/28/08, has disappeared) concerning the question of how much time one should spend blogging.
"Newer writers still trying to build their credibility and client list might protest that they have much more free time than Bly has and they need to find a way to market themselves so blogging is a great, forward-thinking way of doing it. There's something to that, but honestly, I think it's an easy way out, the path of least resistance--what new writers should probably be doing, instead of blogging and reading other blogs and commenting on other blogs and brain-storming ideas for their latest blog post, is what many writers hate doing--cold-calling for leads non-stop."
Of course, this applies to people like me--mostly unpublished, 'new', if you will, and looking for a way to promote my name and my work. First and foremost, this blog is a marketing tool. It's all about increasing exposure. But it's also about connecting with like-minded individuals and sharing information.
According to one referenced blogger, one shouldn't spend more than 10 minutes/day or an hour/week blogging. How in the world are you supposed to have any quality posts with such time constraints? Geez. The guy is really saying that blogging isn't really work, and that time spent blogging is time not spent working.
Another blogger says to blog in moderation--only post every 4-6 days. That way each post has time to stew, be read, and garner comments.
Robin Hobb weighed in on the issue in a decidedly negative (but productive) way. Her reasoning is that time spent blogging is time NOT spent writing. In a way, blogging is a distraction, and we all know that distraction is the enemy. Another way to look at is this: ask yourself if you are a creator or a consumer?
What it really boils down to is finding a happy medium between the two. For some that medium might be more of one and less of the other, or it might be both in equal portions. It's up to the individual and, ultimately, one's goals. If you are or want to become a writer, though, best to heed Hobb's words: "Don’t blog. Write."