In the most general sense, magazines can be broken down into three parts; The cover, the contents and the back cover. But before determining the number of pages for your e-magazine, you should first answer two questions.

1. Who are you hoping to reach with your e-mag?
2. What do you need to show them to compel them to take action?

With these two vital questions answered, you can start setting the number of pages you will need. Also keep in mind that the “magazine” in e-magazine conjures expectations that your publication will have valuable content of some volume and that it will be periodical. So publishing an 8-page e-magazine once a year could project an unintended sense of ‘value-deficiency’.
At most, each issue on an e-magazine can be no more than 100 pages.