Most of the tests I've seen with pro thieves, if you have a U-lock where both legs log to the cross bar (so they can't just cut one) it takes about a minute per leg with a grinder.
So if you had 3 locks, that's 6 minutes of grinding, usually they have it covered with a towel for noise, so it might overheat, someone might see, their battery might die, or they might kill a cutoff disk.
I'd say that's your best bet. Cables are useless.
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