I tested this recipe in a GoWISE 3.7-quart air fryer and a Philips Avance Airfryer XL, which have very different price points and also differ in wattage. By and large, however, the cook times required for both were quite consistent. If your air fryer is smaller, cook the burgers in batches (do not overcrowd the air fryer). Cook the second batch 1 or 2 minutes less, since the air fryer will have already been preheated.