Only those who lack the smarts work hard.
Sure, the new recruits to major investment firms work very hard in the first couple of years.
If they survive, they don’t really have to work hard for the rest of their lives.
Smart people just work when they feel like. They create the machine which will make them money for the rest of their lives and much beyond so there is no need to work hard.
I personally have never really worked hard in my entire life. I just worked enough to not get fired.
People get fired even if they work very hard. For whatever reasons. Smart people find a balance of working and following own interest. How is it done? I don’t know your work environment. Smart people can figure it out on their own.
Work hard and play hard does not work in today’s world.
Work just as much as you need, and play hard.