This was right at the start of 2020, and only working 3 days a week definitely helped me avoid pandemic burnout. But unfortunately I ended up working the 3 days that had the most meetings (this was a double-sided effect - it made sense to work those days else I'd miss important meetings, and then important meetings that included me gravitated to those days). So I ended up with 3 days that were stuffed full of meetings.
This was unpleasant enough that when the division was sold to another company, I opted not to take the transfer (and staying with the old company wasn't an option, as part of the terms of the acquisition deal). I'm now doing some flexi-time consulting that, while not as lucrative, gives a lot more latitude for scheduling my time.