First Liveaboard Trip: Is a Personal Rinse Tank Overkill?

100% agree with Dave and John here. Your housing will not break down because you don't soak it overnight for a 6 days diving trip (let alone a 14 days diving one if you're doing it).

Just rinse it, take a shower with it if you want to make sure, and then dry it properly by bringing it in your cabin.

I've seen more floods of cameras/gopros that were left in rinse tanks than from being underwater! :)