It's definitely that, though there are times when there are stretches of nothing needed doing. But then there are days when I am busy from the moment I get there to the moment I leave, and I leave late. They respect school and work around it, and it's pretty fun, learning about production of shows and movies.
As long as you can do what they say from putting out food to shifting props when people are busy doing other things, and can keep your mouth shut, you can do this job.