i'd guess that while a 4-day week de-jure, it was de-facto a 5-day week with 1 day being free of meetings, manager's micromanagement, communication&collaborati

i'd guess that while a 4-day week de-jure, it was de-facto a 5-day week with 1 day being free of meetings, manager's micromanagement, communication&collaboration (like being able to ignore Slack for the whole day) and other corporate crap. In this case it would mean that the productivity in that 1 day grew 3x to result in that 40% growth for the whole week. Those 3x estimate pretty much matches my experience of how big the corporate crap is a drag on productivity.