How well can the ammount of work done be measured? Has this really not come up yet? Surely, in some jobs it can be measured, and in some it can not. What if it is not clear what jobs are to be done in a day, also the administration of who does what can be a bit hard some times, and people might try to find work-arounds.

I am not sure a 9-17 job makes sense. I think we should probably try do what we want to do; usually that is not work. So we should try eliminate jobs that have to be done by estimating its value for us, by doing it quicker/more efficiently, or automate it. Society seems to overrate work quite a bit sometimes.
Also, perhaps some work can be done via hobbyism too. (Not at all sure how much, really.)

I think it is weird that we still have 9-17 days, since more things have been automated. The reason is probably both that automizing does cost time designing it, and education to use. (But for many people education is more fun then work, though.)
Also, i think we are using more stuff, that are not really making us more happy. No doubt, some of the richer people are also leaching a bit.

Of course, there is still the way how to achieve this in practice to be discussed. When possible, just people starting to work part-time would create scarcity of work, so more that people would be able to afford working less.

Subsidizing automation would be another way, with the additional benefit of promoting technology. It would also prevent jobs being outsourced. However, people abroad not having jobs would mean they would not have income. (As i have said, people being valued less because of the economics of their manpower is one of the caveits of capitalism.) Many abroad depend on our use of their cheap labor.

BTW technology taking away work is also scary, or rather the human as a (probably rather inefficient)construction of matter is. The fact that the human is a rather ad-hoc construction of matter means that with sufficient technology any task (except being a human) is better done with something else then humans.