Easier to research backwards. Florida for example: 181 days or more is considered long term rental in FL. Short term can be defined by city or county ordinances but is generally 30 days or less but research would better define that. In a quick glance I saw a couple FL cities that defined str as 14 days or less. I also see where short term rental is different than "vacation" rental. I think vacation rental in FL bridges the gap between long term and short term rental definition.