> On average for all days of the week, teachers worked 18 fewer minutes per day, and did household activities—such as housework, cooking, lawn care, or financial and other household management—12 more minutes per day, than all other full-time professionals.

This analysis would be a lot more useful if broken down by demographic categories, such as gender, marital status, age, and number/ages of children.

The demographic profile of teachers is pretty different than e.g. accountants or lawyers or engineers.

It would also be useful to break this down by salary bracket.

Anecdotally, my mother, a career primary-school teacher, worked 60+ hours/week most weeks (while school was in session; her preparation/cleanup took also took a couple full-time weeks out of every summer vacation, but the rest of the summer vacation she could travel etc.) for several decades. Much harder than most of the much-better-compensated other white-collar professionals I know.

I’m also not sure if self-reported estimates on a survey are reliable measures of time spent. Again anecdotally, people’s self-descriptions of how hard working they are seems to depend substantially on personality / identity. It would be interesting to see some more direct measurements of time use.

That doesn't mean the annecdotes don't represent a significant problem, it may just not be one that is universal. It may be endemic to certain states or school districts.

Very few of the teachers that just go in at 7, leave at 3 and work to contract, spread around anecdotes about it.

And there's more of those around than you might think.