Re: Synopsis - length thereof
In my experience, the recommended length of a synopsis is extremely variable, and is determined solely by the party asking for it.
I have seen rules of thumb that suggest 1 page for each 10,000 words of text, which is approximately 10 pages/5,000 words for a typical-length novel. I have even heard tell of agents/publishers who want, or will accept, up to 25 pages. But most submission guidelines I've encountered ask for 1-2 pages, and certainly no more than 5.
The purpose of a synopsis is to be a BRIEF description of the main characters and plot points of the work - a selling document that demonstrates compellingly in miniature the page-turning nature of the novel it describes.
A 10 page single spaced document, in my view, is not a synopsis - it's more like an outline.