I did not elect to have a child before considering the impact it would have on my livelihood. I have absolutely considered the impact that having a child will have on my livelihood, as well as on my life in general! I'm merely asking for practical advice from other parents. Are you suggesting that if I've considered the impact that having a child would have on my livelihood, I should not ask anyone for advice? That's quite an odd position to take.
Lets say in 10 years he flips a company. The kid has college money, parents who are financially secure - and if the OP wanted, he could forget the office and spend what would be work-hours with his kid.
I think you may have missed the point of my question. The OP is wondering how he can maintain his productivity with a little sprog monopolizing his time/attention( he was more diplomatic than that, but that's the crux of the issue ).
I then asked why he didn't consider this possible impact on his livelihood( the productivity aspect )before deciding to have a kid.
So, to use your response as a template, I would rewrite with the following:
Let's say in 10 years he fails to get his company off the ground because 4+ hours per day that would have been previously available to him to work on his project were not, due to the presence of a child. The kid has to take out student loans, parents who have nothing to show for 10 years of stress - and if the OP had to, he could take a second job and spend what would be kid-hours with his work.