How long should an eBook be to sell?

Related questions

1. How much does a first time author make?
2. Can you make money on ebooks?
3. How do authors get paid?
4. How many pages is 40000 words?
5. Can I download eBooks for free?
6. How do you get books for book clubs?
7. What is an eBook and how does it work?
8. How do doctors think?
9. How long should a free ebook be?
10. Is printing a book illegal?

Tags

1. #about
2. #nonfiction
3. #count
4. #pages
5. #average
6. #which
7. #minimum
8. #ebook
9. #words
10. #solid
11. #genre
12. #content