Possibly irrelevant but maybe helpful in some situations: I'll add that in college I found we'd have group meetings that went on and on and on. I always made the point of letting people know when the meeting started what the next thing I had going on was. It was easier to get out on time when we have a known deadline.
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Communication is key, somehow you have to make them understand that 5 days of meetings in 15 days of actual working time is insanity. Good luck :-D
This.
Also, communication like this is best accomplished "in peace time" IMO, like, not when stress is high across the team.
It's also good to phrase it in positive terms about how much more you can accomplish on days where you get a lot of heads down time.
This is a good article on the subject, btw: paulgraham.com/makersschedule.html
Possibly irrelevant but maybe helpful in some situations: I'll add that in college I found we'd have group meetings that went on and on and on. I always made the point of letting people know when the meeting started what the next thing I had going on was. It was easier to get out on time when we have a known deadline.