iOS Devs we need your help.

Singapore is recommending users keep the contact tracing app open at all times. Are we really that limited on iOS?

Documentation seems to give more options: https://developer.apple.com/library/archive/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/CoreBluetoothBackgroundProcessingForIOSApps/PerformingTasksWhileYourAppIsInTheBackground.html

I believe that, if I understand it correctly, the OS will ultimately manage memory / energy, and thus at some point likely kill the app.

The question is: how soon? And what options are their to wake the app again?