what about useful jobs which are not productive (in terms of monetization of the time units worked) nor physically demanding? I guess 4 days work for a librari

what about useful jobs which are not productive (in terms of monetization of the time units worked) nor physically demanding? I guess 4 days work for a librarian doesn't mean anything meaningful and the said librarian productivity doesn't plummet like in a "writing math papers" scenario. Or for an emergency doctor, a fireman, a shop owner, a sportsman etc. etc. A friend of mine is an air traffic controller, they work 8 hours straight in 3 8 hours shifts during the 24h they need to cover constantly (meaning they don't even stop for a lunch break, only a few short 10 minutes breaks to stretch or to go to the bathroom) for 5 days straight and then they stay 3 days and 1/2 home, so they work 17-18 days a month. Anyway 9-5 (which is more like 8-~16 in my Country on average, with an hour long lunch break, so ~36 hours/week in total) was won by workers with actual real social battles and 9-5 is the time of the day where the presence of natural light is more probable. We could switch to working 23:00-6:00 but I guess it wouldn't be so good for the morale. Also, I generally really work no more than 1-2 hours per day, the rest is spent thinking about the problem, reading documentation, watching a tutorial, participating in a meeting when I do not have to talk an I can keep the camera turned off and the mic on mute, but mostly is doing something else entirely, completely disconnected from my duties, to enable my brain to absorb the problem and have a fresh view on it sometimes later. Best ideas happen when you're not actively thinking about them.