Approximately, how much time it takes to integrate Game Center in iPhone app? [closed]

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I have to make an estimation of the project. I have to integrate Game Center in this app. I never worked before with game center. So approximately how long it takes to do this. And that will be great if开发者_如何学Python you can provide any good reference for the integration of Game center in iPhone app.

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Achievements and leader board integration is quite straightforward. You could do it in a couple of days.