What is the minimum amount of time required before dropping a second basket of fries in the same vat?

The minimum amount of time required before dropping a second basket of fries in the same vat being 30 seconds is based on food safety and quality guidelines. This time frame allows the oil to return to the appropriate frying temperature after the first batch is added. If a second basket is added too quickly, the temperature of the oil can drop significantly, which may result in undercooked fries that do not have the desired crispiness. Maintaining this 30-second interval helps ensure that each batch fries properly, yielding food that meets McDonald's standards for taste and safety.

Other response options do not align with this standard practice, as they either allow too short a time, risking oil temperature issues, or suggest waiting longer than necessary, which can hinder efficiency during peak service times. Hence, this timing not only preserves the quality of the food but also supports staff efficiency in high-demand situations.