This!! I've wanted to drop down to 18-20 hours TOPS for years. Being in tech, I haven't seen a single opportunity for this being a possibility. When I talk to my managers about it (mostly in large orgs, but even in smaller 12-people shops) they look at me like I'm out of my fucking mind. Response always is "no, you can't be productive enough in 18 hours to contribute meaningfully to the product".