I put the lid on the pan for about 4 minutes before I flip the burger. I like the steam within the lid to help cook the patties. Then remove the lid and flip the burgers. Now I keep the lid off and let them cook for another 4-5 minutes. For your first time you can cut one of them open to see how they're looking, and you may need less time after you flip them depending upon whether you've got a flame, or an electric stove. Cook times may vary. Once you make them the first time, you'll have your timing down for future patties. If you're making 4 burgers, those are thinner patties, so try 4 minutes on the first side, then 3-4 minutes on the flipped side.