Bad for you more than employer. Once you give notice, a freedom comes over you.California's AtWill Employment Law Does Not Require 2 Weeks' Notice. California is an at-will employment state. However, it is considered unprofessional to quit without notice. Assume you'll be let go as soon as you give notice. So don't do it next time. California laws do not require an employee to give two weeks notice to quit work. An employee may quit anytime - even on the same day. Your two weeks notice resignation letter only needs to let your boss know your last day.