When I was just out of school and in my early 20s I worked as much as I could, I probably did close to 12 hours days in my 20s.
I think I probably averaged an all nighter a month for a few years and worked at least one day on weekends and I loved every minute of it.
I said yes to almost all the work I could get. My bosses loved me and I got raises/promotions faster than anyone else. I was able to compress 10 years of experience into about half that time. It really set me up for my career later on in life and I learned so much in that time.
I did the learn a language a year thing and that helped me get a job as a compiler writer.
And I was able to leverage that into becoming a quant as I put in the hours to relearn all the math I'd forgotten from school.
And I was able to leverage that to get into a pretty darn successful hedge fund where I said no to them a few times before they convinced me to join.
I'm now in my 40s with a family and I work far less but I still think it was the right move at the time. It really set me up for a life of success and I was able to see the effects of outworking everyone else pay off.
I didn't seem to miss out on a social life and I had no burn out or resentment to speak of from those days.