All of our products are thoroughly tested to ensure they will last at least 30 days in a normal-sized room at room temperature (without open windows). The Scented Ornaments are really designed to make the tree smell fresh-cut, not the entire house. There are a variety of home environment issues that can cause the sticks to diffuse fragrance faster, including large open-air spaces, high ceilings, open doors & windows, placement near vents, high temperature or high air flow in the vicinity (eg a fan). There is a lot of fragrance in that stick (about 45% of its weight), so it’s usually working even when you can’t smell it as much. If that happens, simply add one or two more.