When it comes to air purification, I always suggest running an air ionizer for 10 to 12 hours a day in any space where you sleep, work, or play. This will ensure that the air quality inside your home is constantly being improved. The amount of time you need to run the air purifier will depend on the size of the space you are trying to clean. If you are looking to clean a single room or the entire house, running an air purifier for a few hours a day should be enough to thoroughly clean the air in your space.
For smaller rooms, half an hour to an hour should do the trick. This schedule will give you all the advantages of an air purifier without needing it to be turned on all the time. However, for maximum results, it is recommended that you use it at least once a day. And yes, it is safe to leave your air purifier on all day.
Just make sure to clean your filters about once a month. Filters trap large amounts of dust and allergens, which can be hazardous to sensitive groups if they are not regularly cleaned.