If you put more than 30 hours of work per week onto a full time, salaried employee, you’re not going to get their best work, especially in creative or expertise-required jobs.

Facts. If you claim you can work more than ~30 maybe 40 hours (that's really pushing it) a week in this type of work without output/quality falling off a cliff, you have lots of room for process automation from my experience. I don't think I do more than ~15-20 hours of actual active programming per week. If I have hard deadlines, pushing that out to 60-80 hours does increase output but nowhere close to linear output.