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The time it takes for an air purifier to clean a room depends on several factors, including the size of the room, the air purifier's Clean Air Delivery Rate (CADR), the level of pollution in the room, and the efficiency of the air purifier itself. Generally, it's challenging to provide an exact time since air purification is an ongoing process influenced by the factors mentioned above.

However, I can provide some general guidelines:

  1. Room Size: Larger rooms will naturally take more time to purify than smaller rooms, as more air needs to be processed.

  2. CADR: The Clean Air Delivery Rate is a metric that indicates an air purifier's efficiency in removing airborne pollutants. A higher CADR means the purifier can clean the air more quickly.

  3. Air Pollution Level: If the room has high levels of pollutants, such as smoke, dust, or allergens, the air purifier will take longer to clean the air thoroughly.

  4. Air Purifier Power: Different air purifiers have different power and filtration capacities. More powerful and advanced units can clean the air faster.

  5. Continuous Operation: Air purification is an ongoing process, and it's usually recommended to run the air purifier continuously, especially in rooms where air quality is a concern.

As a rough estimate, some air purifiers may take around 15 minutes to an hour to noticeably improve the air quality in a standard-sized bedroom. However, for a larger living room or more polluted environment, it could take several hours or more to achieve a significant improvement.

To ensure the most effective air purification, it's essential to choose an appropriately sized air purifier for the room, consider its CADR rating, and follow the manufacturer's recommendations for usage. Keep in mind that air purifiers should be part of a comprehensive approach to improving indoor air quality, which may include proper ventilation, reducing pollution sources, and regular cleaning.

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