Some people may want to work more than 8 hours a day, but a separate question is what maximizes personal and corporate productivity.
I've seen research suggesting that workers can get increased productivity working over 40 hours a week for several weeks, but after that, productivity actually goes negative relative to a 40 hour week, because more mistakes are being made that will require rework.
I've seen research suggesting that workers can get increased productivity working over 40 hours a week for several weeks, but after that, productivity actually goes negative relative to a 40 hour week, because more mistakes are being made that will require rework.