A roto-moulded cooler, or a rotationally moulded cooler, is an extremely durable cooler that is made to keep ice for a span of 5 to 7 days. They are mainly used for the outdoors when there is little to no source of electricity in order to keep your food from spoiling and your beverages chilled. Of course there are other uses for them as well such as fishing, hunting, tailgating, etc. These coolers can sustain the toughest conditions and abuse due to their design and construction.
Roto-moulding is a polyethylene plastic forming process which uses a mould that is placed on these rotating bi-axial arms. These bi-axial arms go into a high-temperature oven which melts the plastic evenly and forms a shape inside the mould. Once they are cooled, the plastic that formed is pulled out and taken to the next step which is the high-pressure polyurethane foam injection. This process gives roto-moulding an advantage over cheap coolers in that the walls and corners are twice as thick and practically impossible to break.
There is more to ice-retention than what any individual can and will say about it, therefore, our answer to you will be more scientific. There are many variables to how long our coolers will hold ice, for instance: the outside temperature, if the cooler is under a shade, what type of ice and how much ice you're putting in your cooler, etc. The short and honest answer would be: 5-7 days.