Having clean air in your home is so very important. We’ve had this Levoit Mini in our room for eight months, and it has made a world of difference. My husband used to have a constant dry cough that is completely gone now. I had a red light indicating it was time to change the filter. I have vacuumed this several times, but it is the first time it’s told me to change it. So I would say eight months for that filter. Life is a great life. Here’s a little comparison of new and old. Even though this is a Levoit Mini, it still packs a punch. Filter has a pre filter, which captures the large particles like dust and hair. It has the HEPA filter, which traps things like smoke, allergens, pollen, and pet dander. And it also has the carbon filter, which helps neutralize the odors and fumes in the air. Another thing I love so much about the Levoit Mini is the fragrance pad at the side, so it cleans your air and makes it smell good. I highly recommend this for any small room.