Dust doesn't have anything you can use to survive, so the regular 4 days (you'll die if you don't have water for that long) and probably less if you have more dust, which is plain unhealthy.
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Is living on dust really living?
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You already do survive on dust.
Everything came from dust, and will return to dust.
What's the point?
Everything came from dust, and will return to dust.
What's the point?
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It depends on which dust are you talking about, and in what conditions.
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You can't.
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5 days(less if you have more)...why