Give notice immediately and give them 3 weeks. If they want to ef around with your vacation, you can say that it's take it or leave it for you.There's also the option to turn your "2 weeks notice" into a "3 weeks notice": state your intention to leave 2 weeks before your PTO starts. After the convention She is going on vacation for 2 weeks with her family. 2. Inform your department and HR of your decision to end your employment with UT Dallas. Thank you for your service to the public at the City of Dallas. This page contains information as you leave your employment with the City. In Texas we are under no obligation to accept the two week notice and it is still considered a resignation because they demonstrated intent to leave. When To Provide a Resignation Letter. The recommended timeline for providing a resignation letter is at least two weeks prior to your planned last day.