It's not only 2-3x longer, but far more difficult. And if you shoot someone in NYC even in obvious self-defense, you're just as likely to get arrested/prosecuted yourself.
Florida Castle Law extends to a vehicle. But it really rests in the ease of getting a gun, and the ability to defend one's actions when defending oneself with it. Shoot someone in Florida who was trying to rob you in your car and the police come and take the body of the dead guy and ask you to give your phone number in case they have questions. That's basically it. Hell, we have County Sheriffs telling people in press conferences that if they try to rob people, they're going to get shot - and "we encourage that." Any criminal trying robbery here (armed or not) is either desperate or really fucking dumb. There's a better than average chance they are going out in a bag. Shoot someone in NYC and see how it goes, even if you are obviously in the right.
When tax cuts for the rich ,military spending, etc is more important to a nation than education,poverty,wealth inequality,healthcare etc these are the results. Evil is to be expected in an evil country.