How to increase 1 life every 30 minutes of device time even when the app is close?

i have a game that have 5 lives and every time you lose the level you will lose 1 life, and if the lives is lower that 5 i want it to be increased 1 life every 30 minutes of the DEVICE CLOCK even if the app is open or close until its reaching 5 lives and then stop increasing...
my question is about the device clock how to make a rule like this wither by tables or attributes witch is the easier way...

thanks guys and im waiting for your asap reply coz i search everywhere in youtube and the forums here in gamesalad and never find anything about this toppic...

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