There's a big difference between physical work and knowledge work. Entirely different types of pain. I've worked 12 hours a day, 7 days a week in construction

There's a big difference between physical work and knowledge work. Entirely different types of pain. I've worked 12 hours a day, 7 days a week in construction, it's only physically hard, it's only physical pain. Solving problems and fighting through headaches, loading context into your head, there's real pain, but it's a mental pain instead.