When barbequing chicken the main thing to remember is to turn the chicken every 15 minutes for even cooking throughout the piece of chicken. As far as the length of time this will depend on the size of the piece of chicken. You will cook a chicken leg for less time than you would cook a chicken breast. The one thing you want to watch is that you do not serve chicken with any pink in it, because you it is not save to eat rare chicken. The best way to keep this from happening is to cut into the chicken to make sure that it is cooked all the way through.