Hello, and thank you for your comment. We apologize to hear about your experience with your helium tank. There are a number of factors that may affect the float time of a balloon, including using balloons other than those supplied with the helium kits, the type of balloon being used, under- or over-inflating the balloon, as well as external factors such as temperature, humidity and altitude. So that we can learn more about your experience and better assist you, please email us directly at BalloonTime@WorthingtonIndustries.com