I want to write a series of E-books related to my Mineral Makeup and skincare venture. I think it would be best to consider each E-book a chapter for a larger book that I would like to publish. But I have no clue what the optimum length of an E-book is.

It seems that it should be shorter than a physical book, because reading it or printing it out would be cumbersome beyond a certain number of pages, but I see some E-books that are over 300 pages and some that are under 30.

What do you think the best length for an E-book is?

I think if you want to check out ebook length and formats, you should investigate the ebook stores on amazon. I know a few people who sell theirs through them, and it's a nice link to your blog.