How long would it take me to learn Swahili?

Okay so I'm English I speak no other language I know a few words and phrases from many different countries I can read basic German like eine Frau unt ein mann stuff like that but I wanna become fluent in a language I'm using a great iPhone app which is like a tutor and it teaches me everything how long would it take me to become close to fluent in Swahili using the app and Swahili language books?

US Foreign Service Institute lists it as "1100 hours of class", just like hungarian, russian, hindi/urdu… The hard ones are listed as "2200 hours" (88 weeks minimum), easy ones at 600, Esperanto at 150 - assuming you are an already bilingual native speaker of english