[edit: I'm guessing you are referring to chart 6, but that data is restricted to "days when they did at least some work".]
Edit: I'm tired, and I'm making a bunch of stupid mistakes. Figure 6 and figure 5 are directly at odds with each other. I can't account for the discrepancy, so I'm going to reduce the signal to noise ratio, and get rid of some of my other comments. I apologize to everyone for spamming stupidly.
If it is averaged across summers, you can have a teacher working 50 hrs/wk during the school year, 0 hours during the summer and have the average come out to less than 40.
With the exception of chart 1, all estimates presented are restricted to persons who were employed during the week prior to their interview and who did some work during that period. Thus, a teacher who was on summer or semester break during the week of the survey is not included in this analysis.
A great way to answer questions about an article someone cites is to actually read it.
But thank you for your respectful response.
So no, it's not averaged across a year (unless the teacher worked a full year).
Firefighters and Police were notably excluded from the recent anti-union legislation legislation they passed in Wisconsin. My guess is because if they had included the Police then who would have kept order in the capitol building? The police would have been out there on strike with the teachers.
Second, the difference in treatment contained in the bill is that public safety employees can collectively bargain on hours, working conditions, and wages, whereas general municipal employees can only collectively bargain on wages. I'm no expert, but perhaps a firefighter sleeping in the firehouse so he can hop on the truck at 2AM faces different concerns than the secretary to the tax collector.