Oven baking boneless chicken breast

The time it takes for the chicken to cook through depends on the oven temperature. The most common temperature is 350F, in which case it will take about half an hour, 30 minutes or so, for an individual breast half to cook. Some will take slightly less time, some slightly more, depending on the thickness of the individual piece. What affects the baking time is the size of each piece, not the weight of the combined total.