1. Address the letter. A two weeks notice letter is vital for maintaining professionalism, ensuring smooth transitions, securing future references, and legal compliance.Just resigned from my job (services sector - I am full time and exempt status if that matters) with an effective date of 2 weeks. Example Resignation Letters With Two Weeks Notice. In the US, two weeks notice is a custom, not a legal requirement. Atwill employees can quit at any time with no notice. However, it is customary to give two weeks notice (or even more if you hold a high level position). When you leave a job, it's considered respectful and customary to inform your employer at least two weeks in advance in the form of a resignation letter.