17.7 km2
Long Island (New York) is a true island, although it is connected to the mainland by man-made bridges (9) and tunnels (13, including rail and transit).
4-6 hours give or take and if you go by ferry usually 4 driving it took me 5 hrs once
Fire Island is part of Long Island. It woudl be more helpful to ask how long it takes to get to Fire Island from a particular Long Island town.
Partially, There is always a water boundary line between states
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