How long should fries be pre-cooked before the "mush" test?

The correct duration for pre-cooking fries before conducting the "mush" test is 2 ½ minutes. This specific time allows the fries to begin the cooking process, softening them adequately while ensuring they remain firm enough to hold their structure for further cooking. The "mush" test is essential as it helps determine whether the fries have achieved the right texture to reach the desired crispiness upon final frying. At 2 ½ minutes, the fries are cooked enough to assess their structure without being overly soft, which could happen if they were pre-cooked for too long. Using this precise timing is crucial for achieving the perfect fry that Five Guys is known for.