Most places won't rehire you without a 2 week notice. A good rule of thumb is to never burn bridges you might want to cross back over in the future.You should include your title, company name, and last day of employment with them. In this article, we discuss what a retail resignation letter is, the key parts you should include in the letter and the steps to writing one. 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. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. No need to get all mushy or tell them why you are leaving. How much notice should I give?