There's a hysterical, tired sense of humor that comes after working 14 hours a day, six days a week. I like those things because they take the pressure off the constant stress.

This quote is referring to the feeling of being exhausted after working very long and hard. It is suggesting that even when you feel very worn out and stressed, you can find humor in the situation. This kind of humor can act as a way to relieve the stress and take the pressure off.