Because of its limited size it should not take long, but the destination and mode of transportation must be known to come up with a specific answer. Far away places with strange sounding names take...
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.
Departure point: Toronto, OntarioDestination point: Long Island, New YorkEstimated flight duration: 1 hour, 17 minutes
Long Island, with an area of about 1,400 square miles, is larger than Rhode Island, which takes up about 1,040 square miles.
In theory it lasts for three months but sometimes it draws overtime.