Set the power air fryer at 300 and cook the ribs for a total of 2 to about 2 and a half hours. This usually depends on the thickness of the ribs and how crisp I want the outside to be. I cook for about 1 hour and then flip them, then cook for another hour. Take them out, add more barbecue sauce and remove the top layer of foil to give the outside layer a little bit of a crust. This usually only takes about 20- 30 minutes. You can turn up the heat to make this part quicker or raise the rack to place the ribs near the heating element. This will do a pretty quick job of crisping up the outside so be sure to watch it and make sure it doesn't burn.