I make this at least once a week. The chicken just falls off the bone and there is very little left over and what is left over usually goes in a curry the next night.
Cook on low for 8 hours or on high for at least 5-6 hours.
Place 4 small balls of kitchen foil on the bottom of your slow cooker to stop the chicken sticking. I rubbed a seasoning on my chicken ( 1 tsp garlic powder, 1 tsp salt, 1/2 tsp each of oregano, thyme, basil). Then placed chicken upside down in slow cooker and sprinkled remaining seasoning on top.
Sometimes I cook it with garlic butter and some herbs too.