It could last up to 30 days, suitable for small to medium size room/living area.Open the Diffuser: Remove the cap or cover from the diffuser bottle.Insert Reeds: Place the reeds provided with the diffuser into the bottle. Allow them to soak up the fragrance oil.Adjust Reeds: If desired, adjust the number of reeds inserted to control the intensity of the scent. More reeds will release more fragrance.