9'6 x 23 x 3 is a classic Longboard starting point... But for knee paddling, I think you need to be at least 23"1/2 x 3"1/4. Even better at 10 x 24 x 3"1/2.... Onwards...
Of course a light weight could knee paddle a stock 9'6 x 23 x 3...
He is back tomorrow. Wait till Thursday lacey and I will be getting my board done. Will be nice to hang with a true waterman car is getting fixed otherwise I would be their tomoz yeeeew