Due to many variables, it is hard to put an exact number on how long a YETI cooler will retain ice. Things like the volume of ice, type of ice, outside environment, and sunlight exposure all impact how long ice will last. Based on my personal experience, I’ve had ice last up to six days in my YETI Tundra 45 hard cooler. Again, ice retention is going to vary in every situation. There are ways to minimize outside variables to increase ice retention, and YETI has put together a list of tips and tricks to keep ice longer.