The cook time of grills can vary greatly. It depends on the size of your grill, whether it’s propane, charcoal or gas and how well it functions. So always use the bottom number I’ve given as a base number to start checking the food consistently. You need to get to know your grill and how it performs. The key to grilling is paying attention to the texture and look of the food. Do not walk away and ignore the food. Big mistake. But also don’t hover and keep opening the lid every 5 seconds. My best advice is to get to know how it works by grilling often and start small. Learn how to grill simple foods like hot dogs, burgers and veggies. Then you can move on to steak, chicken and even roasts. Do not fear the grill. Embrace it. But not literally cuz that’ll burn! Use your noggins!