Quick answer to how long do you cook hamburgers on the grill: Between 8 and 12 minutes.
Determining how long to leave a hamburger on the grill depends upon the thickness of the patties. Half-inch thick, palm size hamburgers require 4-6 minutes on a medium heat grill (350 degrees Fahrenheit). Flip the burgers once and cook an additional 4-6 depending on level of doneness. Using a meat thermometer, the burgers will need an internal temperature of at least 160 degrees Fahrenheit and if pressed in the middle should be slightly firm.