Of special interest, the article includes line length recommendations and techniques for using Zoom (multiple length) Tenkara Rods. Tenkara Level Line Length: A Hassle-Free Guide to Getting it Right
The attached article on choosing the most useful Tippet Length for the fishing conditions you are fishing under is also a different way of looking at things and equally excellent: Tenkara Tippet Length: How Long is a Piece of String?