Depends on what your driving. My old car with manual operated lights does not turn off lights automatically when I park it. My wife's car and my truck does. For some reason on my old car the headlights do turn off when the ignition is off but not the markers or taillights. Anyways forgetting to shut off lights I killed the old battery a few years back on it, so reliving my younger years and being super cheap parked on hills for a few days and popped the clutch to start it lol.That's not really an issue.
If you don't turn them on bad things can happen. If you don't turn them off they'll turn off by themselves.
How long that takes depends on the size of the battery, but they will turn off.
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