How long will it take for residue from a fire extinguisher to settle?

Went to build a fire in my fireplace (flue was open) and the house filled with smoke. Used a fire extinguisher to put out the fire. Then we had a TON of white residue all over everything in the house. We cleaned everything up, but the air is still heavy with dust. How long should it take for most of the dust to settle?
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