how long will a sunfish last on open ocean?

I just recently got a Sunfish for my birthday/christmas present and I have got quite ambitous with it and my boom snapped!!!! It was because of salt build-up inside the goose-neck I have added my own personal touch to the boat (pillow so I can sit,ships,root beer,and I am in the proccess of waxing the hull as we speak.one of my main questions was how long would I survive in the open ocean????? I have been sailing for 2-3 years now and I am getting pretty crafty with the tiller...

how long will a sunfish last on open ocean?