I have been known to author twenty-page documents in a fit of caffeine and have rarely been pleased by their reception. Circulating such epics is an office crime of sorts.<p>However, I think the quality of a document - and the time it takes to understand it - is less about the length, and more about how it's organized. Sometimes a document will have many useful attachments, clearly labelled, that a reader can optionally review if it's helpful. If the document has a good narrative flow, motivation, and structure, then someone can get the point quickly and skip around as they wish. Making documents very short is one way to ensure readers can follow easily, but there are ways to make it work for long documents, too.