There are plenty of people who put in 45 hour work-weeks, and then spend another 20-40 hours on hobbies that are extremely cognitively demanding, and still mana

There are plenty of people who put in 45 hour work-weeks, and then spend another 20-40 hours on hobbies that are extremely cognitively demanding, and still manage to achieve great things during those extra 20-40 hours. It's not a biological limit, it's a motivation/passion limit.