I'd spend the days thinking about building and how you would do it for 90% of the time but only spend 5-10% of my time executing. The rest of the time is thinking, planning, and re-thinking things I've done, imagining the tweaks and enhancements I'd get to pump out when I have the chance.
The best code I write is when I have it all figured out ahead of time, the problem is paged-in, and my fingers are merely transcribing the stream of consciousness. I just need a couple of moments to get it out.
Dissimilarly, I would imagine that, being deployed in Iraq, this guy doesn't have much time to think about his startup when doing his non-technical job (as it IS a demanding one) but imagine being a sniper spending your time hiding in the brush thinking about what you would build when you could build it. I'm romanticizing war now though...