I want to build/finish my second stand up paddleboard from wood (https://sliverpaddleboards.com/ https://sliverpaddleboards.com/). I want this one to stay float

I want to build/finish my second stand up paddleboard from wood (https://sliverpaddleboards.com/ https://sliverpaddleboards.com/). I want this one to stay floating longer than 15 minutes :(