I realize it may be tedious for you to go through my several comments on this topic, but it is equally tedious for me to re-post every link I previously made and repeat myself.

At https://news.ycombinator.com/item?id=28826659 I linked to a BLS report titled "Teachers’ work patterns: when, where, and how much do U.S. teachers work?", at https://www.bls.gov/opub/mlr/2008/03/art4full.pdf . (Note: this is also a 'self-reported survey'.)

Do note this BLS report uses "health care professionals, business and financial operations professionals, architects and engineers, community and social services professionals, managers, and others" as the baseline, and not "people with a bachelor's degree", so it is not a 1:1 equivalence with willcipriano's baseline.

In particular note figure 8 where "Teachers were more likely than other professionals to be multiple job holders" and the caption pointing out how teachers who work over the summer in a field other than teaching are included in the "other professional" category.

Thus, I have a hard time figuring out if a teacher who has an extra job grading an AP exam is counted as "teaching work" or "other professional." I also can't tell if continuing education is categorized as "work" or is one of the other activity categories not shown. (BTW, https://www.weareteachers.com/teacher-overtime/ estimates 100 hours on professional development, not the 40 I mentioned for continuing education.)

This is what I meant by "Different sources give different times, and I am not able to tell how to interpret all of the sources." and why I wrote "I have no belief that a simple analysis using the numbers [willcipriano] presented gives a reliable understanding."

Regarding your statement: "summary numbers [which] cited Bureau of Labor Statistics numbers combined with an objective overall measure of productive working months of the year"

As I pointed out, that same BLS source reports the summer holidays are 2 months, not the 2.5 willcipriano stated, and the BLS source comments that teachers "may also work evenings and weekends to prepare lessons and grade papers." This of course changes the analysis and increases the uncertainty, by an unknown factor.

Regaring "an objective overall measure". That sole measure is "awarded a bachelor degree". We already had the discussion that the median bachelor degree holder doesn't have the accreditation and continuing education requirement teachers have. Furthermore, the BLS "Teachers’ work patterns" document uses "professionals" as the comparison category, not bachelor degree. Why is willcipriano's baseline objectively better than the BLS's?

> If the majority of teachers are so inefficient

You have not established that they are inefficient. I do not even know what this means. How do you measure it?

An airline pilot is paid for flight hours. All other times, eg, flight precheck, staff meetings, etc. are unpaid.

Are pilots inefficient?

> average required work day for teachers is 7.5 hours

Why did you omit the qualifier that "required work day" was only "time during which they are required to be on school grounds"?

Have you established that teachers are expected to have all of their grading and lesson planning done while on school grounds? The BLS doesn't think so - why do you?

https://www.businessinsider.com/teachers-time-spent-after-sc... "spoke to six teachers and asked them how much time they spent on their jobs outside of the classroom. Answers varied, but on average most said that they take home two to three hours of work a day. Additionally, nearly all of the teachers we spoke to said they come into school early, and stay around an hour late."

> well-unionized occupation

Teacher unions are not that strong. Eg, the WV teachers had a wildcat strike in 2018 because the union wasn't effective. Unions in the US are not that strong - Taft-Hartley took away a lot of union power.