Disney's guideline for MIA is noon. They don't offer any for FLL but I would think since FLL is further away, I would wish to allow a little more time. But I'm a person that errs much much more on the side of caution and I don't like racing and rushing and being stressed out. Also, I know my family. They are not morning people!
If you do express walk off and get up early and get off the ship though, you'd be fine.