Normally anything billionaires advocate in changing society is horrible, but in this case I have to agree heartily. Working only 3 long days a week would work

Normally anything billionaires advocate in changing society is horrible, but in this case I have to agree heartily. Working only 3 long days a week would work out great for me. That would give me 4 full days off, plus as a programmer there's a significant amount of "spinup time" as you put it; this just isn't the kind of work you can work on in short bursts. However, I think the 6-hour day plan has some real merit too. I think it just depends on the job. For an engineering or programming job, I think the 11-hour day makes a lot of sense. But for some job like nursing (as in the article), or customer-service jobs where you're running around the whole shift, I think the 6-hour day (5 days a week) makes a lot of sense so workers don't get too worn out.