I used a tippet length of about 5 - 6 feet on my Ayu. That seems to be a typical length. This makes the total line length about 15 feet for the rod that is about 13 feet long.
This is in the tenkara website:
"The length of the tenkara line plus tippet is usually about the same as the rod. Having an overall line that is much longer makes it more challenging to land a fish. We have found the best line length to be 10ft 6in, which allows for longer tippets to be used, and will go well with any of the rods we offer."
You can go longer if you need more reach. I think a general guideline is to not make the braided line plus tippet significantly longer than the rod length so that you can land a fish easier.
Congratulations on having that new shelter named after you!