Do I have to leave my job during office hours? When I got off work, the leader hadn't arrived yet.

It doesn't have to be in your office hours, as long as it is the leader's office hours. According to the Labor Contract Law, employees need to submit a written application for resignation 30 days in advance, and employees on probation need to submit a written application 3 days in advance.

Of course, employees can leave their jobs at any time if the employer has not signed a labor contract or paid social insurance.