NSManagedObject在不保存的情况下会被分配多长时间

Here is the scenario in my app: I download data from a JSON File which I stock in Coredata WITHOUT saving it. If the users wants to keep the data, he clicks on a button, and I save the context. My question is: if the user doesn't click on the button and I don't save the data, how long will the Context stay the way it is? Until the user closes the app? Or even goes to background?Here is the scenario in my app: I download data