Re: Length rod
Welcome to the forum. By float I assume you mean tube or pontoon. In the event I guessed right, you don't want short.
Second, even if you are not going in a tube, and are doing it in more of a drift boat type situation, many times Musky are setting in shallow water and you don't want to be running over the top of them. Getting a decent distance will allow you to cover more water in a more efficient manner.That kind of rules out shorter as well.
I don't see the need to go longer than 9 foot, but I would not want to go shorter either. My rod of choice would be a 9' 10 wt.