The cook time for fresh pork per pound should roughly follow 5 minutes per side for a small tenderloin, 7 minutes per side for medium and 10 minutes per side for large. If cooking straight from frozen add 10 minutes per side and cook until the thickest section of the meat registers 145F with an instant read thermometer. Air fryer pork tenderloin is cooked to medium rare at 145F up through well done at 165F. This resource of recommended pork cooking temperatures is super helpful when determining how you want to cook it.