In office, what does "shift" mean?

Native speaker’s answer
Rebecca
In this video, "shift" refers to "work shift," which is the period of time during which an employee works. You can think of it as a duty period, and it often refers to jobs that are casual or irregular in nature (i.e. part-time or contract). "Don't you have to do a shift at school tomorrow" here is referring to one's scheduled period of work the next day. Typically, you don't use "shift" to refer to one's normal working hours, especially if it's an office job that is from 9-5. Ex: My work shift was long today. I worked ten hours non-stop. Ex: I work the night shift, so I sleep during the day.