I've found that when I work this kind of long hours for an extended period, I get far too attached to what I'm building and have a difficult time accepting that I need to change anything. Likely this happens because I've sacrificed so much to build up to the current state, and changing it would mean that I wasted time working that could have been spent with loved ones, hobbies, or just enjoying quiet.
When you work long hours on a regular basis, you begin to lose a healthy perspective on work and life.