On average, the heating coil of an electric grill takes a maximum of 10 minutes to heat up. The time span may vary depending on the model. However, heating up takes up the least part of the grilling time. It is recommended to protect the grill from direct sunlight and to set it up in a shady place. Other things can be done during the waiting time, as the electric grill, unlike a gas grill or charcoal grill, does not have to be permanently supervised.