How long are the books?

Whether you're looking for a quick read or an in-depth guide, you can choose from four book lengths:

• Comprehensive (250-300 pages)
• Detailed (150-200 pages)
• Essential (70-100 pages)
• Short (30-50 pages)

The book lengths above are an estimate based on tablet-sized pages. When reading the book on a mobile phone, it will have more pages, and when reading the book on a high-resolution computer display, it will have fewer pages.

The final page count can also vary with the subject itself. A "Detailed" book might land at 150 pages for one topic and 300 for another, depending on how much content the subject genuinely needs, and on the occasional book that runs meaningfully longer or shorter than its band. Treat the ranges as targets, not guarantees.

Each book is written once at the length you select. We can't regenerate an existing book at a different length, so pick the length that fits before you buy.