Literally every job I've had in the last 10 years I've self-structured into 4 hours of deep work, 4 hours of everything else(meetings, randomization, etc).
Started by getting into the office much earlier(7-8am) when normal office hours started around 10-11. It's worked very well for me and I've had no problem completing significant work at a good pace.
Oh so you work 8 hour days then? OP is arguing for 2-4 hour work days. So what then? Your particular work situation and career are not the majority of the jobs on the market.
I'm not moving the goalposts. OP literally said "In reality we all work too much. 8 hours a day is extreme, we should strive for 2-4 hours."
Which is completely unworkable for most jobs. Won't work in retail, manufacturing, medical profession, legal, retail, etc. If you happen to have a lifestyle job where you can have a high discretion over how your time is spent, that's great...happy for you. But denying the realities of other professions just underscores the ignorance of this whole thread.
Started by getting into the office much earlier(7-8am) when normal office hours started around 10-11. It's worked very well for me and I've had no problem completing significant work at a good pace.