Blog Posts: How Long is Long Enough?

I'm writing this today in response to a post in a LinkedIn group that brought up the issue of blog post length. There was an article cited about this and we were asked our opinion on the question of what is the right length for a blog. I suppose the issue of frequency is also at play here but as someone who barely writes on her own blog (my last entry was just over two months ago!) I am not going to go there today.