No air fryer needs pre-heating at all.  No matter what cuisine you are intending to make using your air fryer, you don't have to pre-heat it. An air fryer gets ready instantly after your command.  Pre-heating the air fryer can cause internal damage to the machine. It can even ruin the dish you are going to put inside right after the pre-heat session.  But still, if you insist to pre-heat, then you can do so but only for three to four minutes. You just have to turn on the fryer and put the timer on the desired time of pre-heat.