I am not sure the answer to this, but I have gone away for a little over a month without a battery disconnect and it fired up fine.
Just ensure you Lock the car when you leave it, as that tells whatever gadgets to not remain alive, eg hvac - the bit when you sit in your car with the engine off, and 5-10mins later you hear some movement sounds of the climate control vents
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2012 Jeep Grand Cherokee Limited 3.6L v6, Mineral Grey.
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