In most cases, two weeks is a generally accepted amount of notice to give an employer before resigning from a position, according to About.com. An employment contract that states another length of notice as well as other extenuating circumstances can cause this time frame to shorten or lengthen.
While it may appear preferable to give an employer more than two weeks of notice when possible, this can also lead to an employer ending employment even sooner than expected, according to U.S. News & World Report. Use past experience from other employees resigning from a similar position and the way in which they were treated as a guide for how much time in addition to the standard two weeks is appropriate to give within a company.
Write a resignation letter to provide to the employer to maintain a positive relationship as well as get a reference when needed, according to About.com. Mention the positive aspects of the job and how it has been of benefit. In a case of physical abuse, sexual abuse, an unsafe work environment, not being paid the agreed upon wages or being asked to carry out illegal activities, it is acceptable to quit a position without notice.