You know yourself but I think it's extremely unhealthy advice to give to people and usually hides a lot of inefficiency and misused hours.
Constraints breed creativity and efficiency. Do more with less and all that.
Have you done the exercise of "how can I produce the same value output in 80% of the time". The exact percentage doesn't matter, just doing the exercise to improve efficiency and have a more balanced approach. That also gives you space for actual crunch time whereas you seem to work in a perpetual state of crunch.
Is it real or is it performative? Are you taking care of health? Do you realize work is not everything to life and that you CAN have your cake and eat it too if you slightly balance it out.
Again, what you're doing might work for you but I'm trying to offer a slightly more nuanced take than what I consider it to be the "constant crunch" mode.
Busy doesn't mean value.