How to Use Two Weeks Notice Letter? 1. Maintain a Professional Tone; 2.Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. A two weeks notice letter is vital for maintaining professionalism, ensuring smooth transitions, securing future references, and legal compliance. Two weeks is a professional courtesy and just the common expectation. It's really up to you how much notice you feel is reasonable to give. You want to give at least a two weeks' notice. Giving a two week notice isn't required; it is merely a professional courtesy. At the top of your letter, include your contact information, the date, and your employer's contact information.