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Here's a thing. Even in the Before Times, there were a bunch of people who thought a one hour teaching class was 60 minutes even when it was officially 50 minutes, making it difficult for other people using the rooms, and their students to get to their next thing.
And there were people who organized all day meetings without a decent lunch break and coffee breaks because they wanted to cover so much stuff they didn't have time for that.
But even the people who were good about an hour is really 50 minutes, and all day events needs regular breaks, seem to be abandoning those principles now that things have gone to remote.
**no one can concentrate for that long** seriously, folks. Even if "zoom fatigue" is a thing, it's being masked by a lot of practices that would be fatiguing f2f. Stop it!!
If you are in any position where your choices restrict other people's choices, make choices that build in breaks. That means build them into your teaching, and any meetings or events you organize. No matter what the meeting format.
If you are a head of department, dean, or someone with real power to affect working practices of many people, **actively** encourage building in breaks. Make a policy about how long a "teaching hour" is (no it's not the same as a clock hour, never has been).
If you are in a secure position with some seniority, model good practice and leave meetings at their end times, propose holding over agenda items or whatever else will help end meetings at their scheduled times.
No one needs an excuse for a 10 minute break between classes, or between meetings, or in the middle of a 2 hour meeting. No one should be sitting for that long without moving. People will focus better with regular mental rest, and opportunities to attend to physical needs.
You may do mainly mental labour but your brain is part of your body.
