The maximum number of blogs

There's obviously no rule that a person can't have ten, twenty or even more blogs. However, there is definitely a maximum number that I can manage. When I had one blog, it fairly easy to maintain it almost daily. Occasionally there would be topics I wanted to write about that didn't fit the stated aim of the blog, so I start another. Then I began making salads with a friend for lunch and people were ogling them so I started the third blog to record and share our recipes. That was pretty manageable.
I currently have four blogs to my name (see the sidebar, if you want to see the others), but some get more attention than others: one is very active (almost daily), one is sort of active (roughly weekly), one is barely active (monthly-ish) and the last, These Girls' Greens, is no longer being updated. I would like to update the salad regularly and several times I've intended to go back to it, but I've reached my max.