The time it takes for an egg roll to get cold when left out of the fridge depends on several factors such as room temperature, humidity, and the initial temperature of the egg roll itself. However, as a general rule, perishable food items like egg rolls should not be left at room temperature for more than two hours.
Bacteria can grow rapidly at temperatures between 40°F (4°C) and 140°F (60°C), which is known as the "danger zone." When food remains in this temperature range for an extended period, it becomes more susceptible to bacterial contamination and can cause foodborne illnesses if consumed.
If you have left an egg roll out of the fridge for more than two hours, it is advisable not to consume it. It's better to err on the side of caution when it comes to food safety to avoid potential health risks. When in doubt, throw it out.