In a 4 day work week, which days should be off?

I think is better to think of a 30-35 hours whenever you want to. Typically performed sometime between 9-5 M-F because that’s when customers, vendors, coworkers are often working too. But if it’s a beautiful day on a Tuesday maybe you just hit your two hours of important meeting and then go outside for the rest of the day.

Or your kids has a school play so you work just an afternoon one day.

At least that’s what I like…