Great answer, that's exactly how I feel. It's all a question of expected return. With one small difference ... I have a 3-year old son. Working day and night i

Great answer, that's exactly how I feel. It's all a question of expected return. With one small difference ... I have a 3-year old son. Working day and night is always within reason for me, because no matter how much I could gain, I'll always regret the time I haven't spent with my son. Therefore I work in waves. I have weeks in which I work 14-18 hours per day, followed by weeks in which I spend more quality time with my family. The effort also has to be rationalized. Working long hours for sustained periods leads to stress and mental exhaustion, which ultimately impacts your productivity negatively. You always have to (1) be careful and listen to your body when it shows signs that you need to rest and (2) reflect on your productivity, because it doesn't matter if you work 14-hour days if you don't get anything done. Sometimes taking a step back and relaxing for a bit does wonders for productivity.