What is the maximum time food should be left out at room temperature during a buffet service?

The correct answer is that food should not be left out at room temperature for more than 2 hours during buffet service. This guideline is based on food safety principles designed to prevent the growth of harmful bacteria. When food is held at room temperature, the risk of bacterial growth increases, especially within the "danger zone" of 40°F to 140°F, where bacteria can multiply rapidly.

After 2 hours, the likelihood of food becoming unsafe to eat increases significantly. This is particularly critical in buffet scenarios where food may be left out for extended periods. To ensure food safety, it's advisable to monitor the time food is on display and take appropriate measures such as keeping it at the right temperature or discarding items that have been out too long.

The other options either exceed the safe time limit or imply limitless time, which contradicts established food safety guidelines designed to protect consumers from foodborne illnesses.