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How long can you leave your Tesla sitting without being charged?

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It drops to about 20% and then starts turning everything off. There's a number below there that it shuts everything off.
The answer is basically forever.

It will disable remote HVAC at 20% or lower, but not when you say keep the door open. It will continue to run. The car will shut off when the battery shows 0 miles left. If you are lucky you might get a little more. At that point the battery has a few % left but those are needed to prevent battery damage. So when the car shuts down due to low battery you don't have to panic. It won't damage your battery, but you should not leave it like that for long.