I mean there's people who are barely working right now, including many people who are barely working at multiple companies and getting paid for full time employ

I mean there's people who are barely working right now, including many people who are barely working at multiple companies and getting paid for full time employment at all of them. With that in mind, scaling back from 8 hours to 4-6 while still delivering everything you need to deliver seems very achievable. And in many places that level of commitment is the norm - everyone including management is working those reduced hours - companies just aren't spelling it out in their contracts.