Teachers were left on their own, without any support from PiS Ministry so no wonder everybody developed their own system
I do partially blame schools for this. It shouldn't have been difficult for headteachers to sit down with the Rada Pedagogiczna to come up with something viable and consistent, but it seems that many of them ducked out of their responsibilities. I've seen one article recently where a woman stated that she was 100% behind teachers until she saw how bad things were, and the thing that broke her was seeing the vice-director shopping during the school day in a shopping mall when the kids didn't have any online lessons at all.
Seriously, it might work with the youngest from grades 1- 3. Older grades, let alone high schools, will sneeze at those rules.
Ours won't have a choice, as they'll be told that these are the sanitary regulations and that anyone breaking them will be punished. I have a realm of annoying punishments for kids, including my favourite Scottish tradition - the punishment homework ;) The older ones will probably push it as per usual, but well, they better comply or else :D
In my Repetytorium Maturalne, it is called common room. Is it a proper term or the authors duped us?
Hmm. I think so, though the concept doesn't really exist in British English - it would be an after-school club if anything. Common rooms are usually only for the oldest kids in high school. For instance, our high school common room was only for the oldest kids (16-18), while those in the first four years were banned from using it. There weren't any teachers there, but there were cameras.
It looked a bit like this: media.lalschools.com/picture.php?/1048 - and we would use it if we had a free period, or 'window' as you call them here. We had a lot of them - for instance, in my 5th year of high school, I had something like 6 windows throughout the week, and in the 6th year, I had one day where I had a lesson from 9-10:20, then I was free until 2:40, then another class until 16:00. Usually in winter, I'd just stay in the common room because it was too cold to walk home.