[quote=@Obscene Symphony]
Can someone help me out? I can't seem to remember, how long has the park been in the works/operational?
[/quote]

"Set twenty-two years after the events of Jurassic Park, Jurassic World takes place on the same fictional island of Isla Nublar, where a fully functioning dinosaur theme park has operated for ten years."

So says the Great and Powerful God; Google.