Earlier quoted context omitted.
I worked in restaurants and bars when I was younger, and pulled in 80-100 hours every week for a few years. When I got my first engineering job I did the same thing, trying (successfully) to learn and develop my career as quickly as I could. I’ve also gone through phases of working 60+ hours as a contractor, trying to save as much money as possible. For me at least, doing that much productive work in a week was never…
I did this when I was young, and I don't think it got me anywhere. I should have spent my 20s doing a lot surfing or something, anything really other than what I did. I should have got home at 5, and if that got me fired, whatever, got another job.
I had to work to support myself during college, so I was already used to the "grind". So I decided to keep up the high effort and accelerate my career while I was young.
You can have fun at any age. But investments pay off over time, so it made sense to invest in myself early. Now that I have a good career and don't have to prove myself, I can take things a little slower and have fun "surfing or something". Plus, now I have the money to actually fund my hobbies.