In Iowa, roughly 30-50% humidity during winter, a 2-oz jars filled with XiKar will last for a couple months in an average sized humidor of 50-100 cigars, and keep it right around 70% humidity as advertised. Thus, one of these 8-oz bottles should last several months. I have the 2-oz jar currently in a 28-quart cooler and it's running around 65% using an analog hygrometer adjusted using the "salt test." So with larger humidors you may want the 4- or 8-oz jars.
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