Learn how to write a resignation letter with a notice period. It's customary to give at least two weeks' notice unless you have a different agreement with the employer. 6.Typically, professional norms suggest providing a two-week notice period, so resigning more promptly can disrupt operations and cause logistical difficulties. The short answer is that an atwill employee is not required to provide two weeks' notice before quitting. After you've had the conversation with your boss, it's important to provide a written resignation letter.