Resignation letters are professional courtesies that extend your professionalism, even in the last days of current employment. A two weeks' notice letter of resignation is a professional courtesy and at times a contractual obligation.Here's how to let your boss know you're leaving. Generally, two weeks is the appropriate time for notice. However, make sure that is stated in the company policy—it could be more. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. Notice Period: Adhere to the notice period outlined in your employment contract. Use one of our resignation letter templates. In this article, we discuss how to create a 30day resignation letter, why it's important and provide a template and examples to help you write your own.