There is an inverse correlation between the number of hours we work and the effects it has on our lives.
Studies point out that 40% of people are working at night (after 10 PM.) The same studies show that knowledge workers are only productive for 2 hours and 48 minutes a day (working on their most important tasks).
One of Aesop's fables is about the race between the tortoise and the rabbit.
In life, we have both inside us. One urges you to go fast; the other to go slow, but steady. Sprinting at times is good, but we should not think we can always rely on our speed as we will burn out. We achieve more by making a little progress every day.