In florida, where you don't get freezing weather, it really doesn't matter whether it's 240 or 120. Depends on what you need when you get back. Definitely wouldn't have it above 80%. Frankly I'd suggest 50%. But that depends on what you need when you get back. Of course, you can always get on the app and up the charge just before you get home.
As a side note 240 volt charging is much more efficient than 110.