There was a mod available for a few days that cut the work time of sims in half for every career. Same days, just half the hours and same pay. It has been taken down, though, as the creator wanted to finetune it a bit more. So it's definitely possible.
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Can you elaborate? Many job positions already only work a few days out of the week.
http://bonehildastreasurechest.tumblr.com/
Nice, I was gonna take a crack at it but now I can work on something else
Yay! Thank you so much!