I am in California. I was told that an employee is required to take a half an hour unpaid break after six hours.
Exempt employees are exempt from the privileges of the law, including breaks, lunch and overtime.
Theoretically, your employer should not be keeping track of who works how long among the exempts. Ideally, you are getting your job done, whether it takes 30 hours or 60. There is another potential issue here, however. Even if this means you are working nine hours a day, you are not entitled to overtime. As a practical matter, the reason the Legislature in its infinite wisdom, granted lunch breaks was due to the recognition that people work better, feel better and remain healthier longer when they take task breaks throughout the day.