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A few days is what people say when they don't want to hear your sob story anymore. It means the problem will go away eventually, but only if you stop whining about it.
"I'll be back in a few days," he said, then vanished for two weeks.
"A few days? I've been stuck here for a few days and it feels like a few years!"
"You'll be fine in a few days. I'll be fine in a few days. I'll be dead in a few days."