Weigh or measure your fries and place them in your basket. They don't need to be in a single layer, but spread them evenly.
Air fry at 400 degrees F for 15-20 minutes, or until desired crispiness is reached. Mix at the halfway point and check on them often, towards the end of cooking.
Notes
Check on your fries often towards the end of cooking to prevent burning them. Since all fryers operate differently, some may cook faster than others.