The safe internal temperature of a cooked chicken is 75°C. When roasting butterflied chicken on a high heat you can reach this internal temperature in about 45 minutes. The meat is usually cooked and safe to eat but it doesn’t fall away from the bone easily and I found out it can still be a little bit tough. I like meat that peels of the bone without any force and is very soft. This is why I always leave the chicken in the oven 10 – 15 minutes longer.