If I double I usually do two or three paragraphs per character [i]unless[/i] that character is not really a big part of that scene. If they aren't I keep it to a 3 or 4 paragraph. Sometimes if I try to write to much it'll seem forced and I'm a firm believer in quality over quantity. I'm by no means advanced, but more of a high casual writer.

And for the time travel I was thinking of Slice of Life. Maybe a woman gets sent back in time very far back where she has to learn the social norms. I read this book once (titled 'Outlander') it is one of my favorite novels to this day. The woman gets sent back to Scotland back when clans and such were a thing. (Think medieval times really). It was very interesting and ever since reading it I've wondered what sort of spins I could put on it myself. I'm decent at playing characters that are out of his/her element so it could be fairly interesting.