How long can jello stay in a cooler?

Jello can typically stay in a cooler for about 4 to 6 hours, depending on the cooler's temperature and how well it's packed with ice. If kept at a consistent, cold temperature (below 40°F or 4°C), it can last longer. However, after this time, the texture and flavor may begin to degrade, especially if it starts to warm up. Always check for any changes in appearance or smell before consuming.