We put 37% down on our Mojo and financed the rest for 12 years. This was only possible for use because we used our old boats equity to come up with the 37%. I would have financed longer but my wife vetoed it. IMO finance 15-20 years and then just pay extra if you can to get it paid off early. I don't like the idea of tying up all my monthly income in mandatory debt spending. If you finance for a long term and some kind of emergency happens you can pay the minimum payment while you work through your situation or try to sell the boat and if times are good and you have some level of self discipline then you can always double up or triple your payments to avoid interest. If you finance for like 5-10 years you can get in a bind quick if life throws you a curve ball.