This only needs a few minutes to preheat.  I love the broil feature just to cook fish and sometimes a steak. I also use the broil feature just to melt cheese .  After cooking a cheeseburger.  The rack that is included is great for broiling.  The food cooks so much faster than anything on the stove or my oven. Do hesitate to buy this.  You will not regret it. This met my expectations and some. Good job Ninja!!!!  Well made not flimsy.