Two to three minutes at most should be plenty of time to cook s'mores in an air fryer. Of course, there are many models of air fryers on the market. Like ovens and microwaves, power levels vary. Experiment to see the ideal time for your air fryer. My Innsky roasts marshmallows at 350 in under two minutes. Melting the chocolate is another step and that's usually done in under 15 seconds. Don't walk away from your air fryer while making air fryer s'mores.