8-9 hours of mind numbing work every day will be 8-9 hours of demotivation. Also you've reached efficiency cap by 4-6 hours. You'll find many variations of norm

8-9 hours of mind numbing work every day will be 8-9 hours of demotivation. Also you've reached efficiency cap by 4-6 hours. You'll find many variations of normal, though this may warrant studies.