That's a good point. It really depends on usage, though it's not unfair to just use the average when writing an article. And by that standard, 'a few days' is probably fair.

During the winter, that kind of battery capacity could power us for a couple weeks. Everything other than the furnace blower is natural gas. During the summer, ... well, fortunately we don't need air conditioning here to survive (one-off 117F events notwithstanding).