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It's mandatory to have your lights on in Hungary, but someone told me it's not in the UK. I don't know about the US, though. But I don't recommend to turn it off. When it went out and I was on the road (a busy 2x1 main road at that) for like an hour before realizing and replacing it, several drivers started overtaking facing me not noticing that I'm in that lane - so I'd say it can get really dangerous.
Anyway, I don't know how long could the battery hold. I often FAS Teresa on steeper downhills and before stopping (at red lights, for example) and it has never run out of juice, but the time when the engine is on is usually much longer than the FASed time (I'm much more on open road than in cities).
In theory, just the normal lights and electric components (fuel pump, for example) could drain the battery in definitely less than two hours, ignition draws power too (don't know how much though). (We have a 12Ah battery in Teresa and a 7Ah one in Ciliegia). All in all, I don't think they could run for more than an hour without charging (probably less).
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