Teachers, what are your hours like in studios?

In studios that are separate from your private teaching hours. I teach at a studio and is booked 5 hours straight (no break). It's...not exactly what I expected you could say. I just am worried I'll get tired throughout and the quality of my teaching will go down.

I don't want it to seem I'm complaining. I was just surprised that my employer still added another student on my list when I thought I was completely booked. A small break would be nice to recover. If it is normal to be teaching 5 hours straight weekly, what are your tips on handling this?