The workload will depend on the type of school you're teaching at: Public vs. Private. Usually, working hours at a private language center are higher than a public school (pay accompanies that, meaning the more you work, the more you will get paid!). You should plan to be in the classroom about 16-22 hours per week with a public school, and 20-30 hours per week in a private school, with the remaining hours (to make a 40 hour work week) being dedicated to lesson planning, grading, meeting with students etc. Many public/private schools will want you at your desk from 8-4 if you're not teaching, while other schools don't care too much. Also if you work at an academy, you might have to work nights and weekends.