^ LOL I don't think any author would say "I wish she would just stop reviewing," unless the reviewer in question was more of flamer or nitpicker. Generally, though, no one complains about getting too many reviews LOL. And if anyone did, I would have to smack them.
I don't review everything that I click on and read part of, but anything that I read in full, I review. If it's a story that is already finished when I start reading it, I usually wait until the end to leave a big overall review, or I review halfway through or something. It is easier than having to review every single chapter. And honestly, sometimes I don't really have much to say after one chapter, not like I would at the end of the story, when I know the overall picture.
When I'm reading something as it's being written, I tend to leave a review after every update... so every chapter or every few chapters. It's not time-consuming because the stories I read only get updated once in awhile; I think I can spare a few minutes to give some feedback once in awhile. I really hate the excuse of "I don't have time to review," because, seriously, reviewing takes only a fraction of the time reading does. So if you have enough time to read in the first place, you have enough time to leave a quick review. If you're reading a chapter real quick before you have to run out the door for work or something, you can always come back and review it later. "I don't have enough time" is a total cop out.