One of the first things you need to decide before writing your eBook is deciding what size to do it. After all, much of what you need to do is highly dependent on the size of your eBook.
Of course, the life of your eBook will vary from that required by the market. You must also decide how long your subject needs. After all, your customers pay for the content, not the fluff. However, you must always be in this range in order to be treated seriously.
Unfortunately, the eBook market is currently changing. Even more unfortunately, this also applies to the number of pages your eBook should have.
One thing that has not changed, is that the number of pages your eBook should have depends a lot on the purpose for which you will use it.
Electronic books offered for sale are traditionally much shorter than a traditional book. Fifty to a hundred pages were pretty common for ebooks. In theory, it was because the ebook was much more difficult to read and use.
However, with the entry of traditional books in the e-book market, there has been pressure to reduce the price of ebooks and to increase the size to the same size as traditional books. Traditionally, executive books have run from one hundred to two hundred pages. However, like most books published traditionally, they are under pressure to increase their size. While the market has been slow to react, it is likely that 200 pages will be the new target for eBooks in a few years.
On the other hand, there is, has been and will probably always be a very short e-book market of less than 40 pages. These eBooks are used to answer or solve a single question. For example, you might have a report discussing the effect on the white paper market and reports of changes in the e-book market. These eBooks have been the traditional justification for reduced pages in the eBook market. However, they are really a different but related market. The most important change that can be expected is the removal of the ebook description and the return to the condition report or the white paper. This will allow these mini-eBooks to be sold as a separate market, unaffected by the lower price of eBooks.
Free eBooks are traditionally shorter than an eBook for sale but longer than the white paper. After all, you do not really want to devote much effort to something you are going to give. Traditionally, they ran below 50 pages. In fact, many free eBooks were actually only reports or white papers. However, even free eBooks will likely be affected by increased expectations. It is likely that the free eBooks will be segmented into ebooks of more than 50 pages and shorter free white papers.