The best way to check your Turkey Breast for doneness is to use a meat thermometer and be sure the center of the breast is at least 165 degrees Fahrenheit. If you don’t have a meat thermometer, it will be a little tricker to get the times correct on your cook. I recommend using the instructions given with your personal air fryer since all the times will be different. Generally, with a turkey breast that has a skin side on it, you will need at least 30 minutes, starting with 20 minutes on one side. When I can’t find my meat thermometer, I slice into the thickest part of the turkey to check doneness after about 30 minutes. It should not have any pink left and juices should run clear when the turkey is fully cooked. The larger the turkey, the longer time you will need. 30 minutes is for a relatively small turkey breast. Larger ones will need 40-50 minutes.