If you are truly exempt under the Fair Labor Standards Act, then your employer can require overtime without providing extra pay. There are some industries that have rules that govern how many hours an employee may work. However, as a general rule, employers may require as many hours as they want. An employer that makes unreasonable demands on employees' time takes the risk that employees will quit, and attrition is costly for employers. In other words, for most employees, the threat of quitting is the only leverage. Good luck.