We like to go to FL twice a year, usually May or June, then December. We go for 10 to 14 nights. In May/June, we spend 2 or 3 nights at the beach first. In colder weather, we spend most, if not all, of our time at Disney. We always try to go start or end on a holiday to save vacation days.
For instance, in May, we are going May 18th to 30th, but we don't leave until the evening of the 18th so I won't use a vacation day then, and 2 weekends don't count as vacation days, and the 30th is a holiday, so I only use 7 vacation days for a 12 night vacation.