Each ice bath session should last between 5-10 minutes. While you may think the timing is too short, you will be tempted to get out of the barrel quicker than the recommended duration, especially if you’re new to ice baths. If you spend 15 minutes or more in a cold bath of 10-15 degrees C, you face the risk of getting hypothermia. Hypothermia is a medical emergency that occurs when your body temperature drops below a safe level (37 degrees C/95 degrees F). Dangerously low body temperature can cause heart failure and even death.