[dahfizz]

> I don't know of a consensus, but I've seen many studies where >20% of people self report working ~20 hours per week.

> Many studies like this: https://www.inc.com/melanie-curtin/in-an-8-hour-day-the-aver... - say that the average white collar worker only works ~20 hours per week.

Another way of phrasing this is that people tend to be productive for 50% of the time they spend "working". It's not self evident that people will still be productive for those 20 hours if the work day was shortened. It could just as easily be the case that people will still goof off for 50% of the shortened work day.

[ghaff]

Right. Even if I, say, spend half the day taking a walk, vaguely mulling some task in background, doing some vaguely related reading, chatting with colleagues etc. doesn't mean I'd get as much work done if my hours were 9-1. Would I get more than 50% of my work done? Probably. But I'm pretty sure it wouldn't be 100%.

I actually think if I took every Friday off, I could probably hit pretty close to current productivity but I work a pretty flexible schedule and don't have to do a lot of coordination.