The freezing time for an ICEE machine can vary depending on the specific machine model, settings, and ambient conditions. Generally, it takes around 20 to 30 minutes for an ICEE machine to freeze the liquid mixture into a slushy consistency. However, it's important to note that this is just an estimate and the actual freezing time may vary. Factors such as the initial temperature of the liquid mixture, the capacity of the machine, and the surrounding temperature can all affect the freezing time. It's best to consult the manufacturer's instructions or guidelines for the specific ICEE machine you are using to get accurate information on freezing times.