Reduced Work Week and Compressed Work Week are a (relatively) new concept that some Annualised Hours Contract workplaces are doing
Reduced: You work 4 days of 7.5 hours, adding up to 30 hours weekly, you get paid the same as if you worked 5 days of 7.5 hours (37.5 hours)
Compressed: You work 4 days of 9.5 hours, adding up to 37.5 hours weekly, you get paid the same as if you worked 5 days of 7.5 hours (37.5 hours)
I used to work a job with a 3-day work week, 12-hour shifts. 36 hours a week, company paid for 40. This was also physical labor, not an office job.
Four-day work weeks were nice and all, but commuting during the week was brutal. After work, I’d have just enough time to drive home and go straight to bed, waking up just in time to go back. I honestly debated sleeping in my car sometimes, just so I could get more rest during the work week.
In my trucking career, one of my past jobs had me on a 4 days on/4 days off structure, which sounded nice on paper. But that company had a ton of behind-the-scenes problems that made things more stressful than they were worth. I would often have to work a fifth calendar day to end my rotation at home, and I never made anywhere near the money that company claimed I would.