Why do we all work overtime? Because other teachers do

"I love representing my clients in court, so I love working overtime for no fee,” said no lawyer ever. 

Most self-respecting organisations acknowledge that it is unhealthy for employees to work ridiculous hours. Not schools. In fact, not only are schools willing to allow their employees to work ridiculous hours, they expect it. 

I have heard teachers say things like: “I keep Saturdays free, and I only work about four hours on Sunday. I think that’s fair enough.” 

No. It is not fair. It is wrong. You are using your free time to catch up on work, which then increases the expectations on other teachers to do the same. Working overtime is not something to be proud of, and it leads to an unhealthy work culture in which expectations become unmanageable.