The air fried peaches are done when the tops are browned to your liking and the peaches themselves are tender. This will depend on how ripe the peaches are and your own personal tastes. The cook times will also vary based on your own air fryer. So, don't be afraid to take some quick peeks during the cook time, and if you think the peaches need a little more time, check again after 1 - 2 more minutes. You can check on how soft the peaches are getting by piercing them with a fork.