I share this sentiment. The author needs to consider which thing will cause him more regret in the long term--working a more normal schedule and potentially missing out on whatever rewards living the startup life may give him, or definitely missing out on his daughter's childhood.

For me it would be (and is--I have two sons) a no-brainer. I actually am working at a start-up, but it's one that places a high value on work-life balance so I never feel that I have to work outside of 9-5. I have cracked open the laptop on the occasional evening just because I enjoy what I'm working on, but I definitely wouldn't want to miss this period of my kids' lives for anything. They're only this young once.