Does your over really take 30 minutes to heat up? Mine gets to 350 in about 7-10 minutes. It's a mid-range GE model. Nothing fancy. Preheat. Do your chopping, sauce prep or whatever. Oven is ready by the time you are really ready to put anything in it.
No doubt, an air fryer made my son's college dorm experience so much better but I don't see the appeal for anyone who isn't single or who has a proper kitchen already.