Ask HN: Startup with Small Children

I am thinking about setting up a startup. I am a scientist and I see increasing commercial interest in my field, as well as some potential problems that could be turned into a startup. However, I have a 1.5-year-old toddler and my wife and I are planning to have another child in the near future. Sometimes I think I want to start something on my own and give my research a useful application. On the other hand, I hear so many founders working 60–80-hour weeks, and that's just not possible right now. Could you tell me about your experience?