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> the installation should happen in class

Class time is far too valuable for this kind of nonsense.

In the US, teachers are underpaid for what they do (47-69K across the whole US, COL varies greatly), pay for many supplies out of their own pocket, and do not receive salary during the vacation months, so they often take summer jobs. When not teaching classes, they are also expected to use their "free" time creating classroom plans, grading papers, coaching homework, and appeasing parents in every way.

At least in Poland even during vacation they are required to be at school for administrative reasons. Doing nothing, but still forced to be there.

Don't know if it's paid vacation, but part of the monthly salary is reserved to pay out next years vacation