How long does it take for dust to settle after cleaning?

According to the American College of Allergy, Asthma, & Immunology^[1] https://acaai.org/allergies/types/dust-allergy it can take more than two hours for the dust to settle after a thorough cleaning. This is why so important if someone has a dust allergy in your family, you should do the cleaning when the allergic patient is away, and avoid cleaning the bedroom of an allergic person at night.