>>7284959Make it as short as you can, I think. I really don't like it when a book drags unnecessarily.
That said, I have read several long books I liked a lot, because they actually had a lot to say slash needed a lot of my time to put me in a place to understand and feel it.
Volume can be a deterrent to purchase though, I usually avoid engaging long books until I know quite a bit about them and am fairly certain I'll enjoy them.