[Todd]

As you know, 4-5 hours a week won't get you much. Even a POC will probably take a few months at that rate. The ratio is inverted. It should be two devs to one business person. As others have pointed out, you're going to be doing all the work while they're glad handing and doing lunch. Also, not having the background, they will have unreasonable expectations and will have no appreciation for the amount of work you put into it over time.

It also sounds like you have goals of your own. There is a true opportunity cost here. This will be your side project for longer than you probably expect. You don't really get any others if you're trying to get a business off the ground. I'm not sure how old you are, but divide the remainder of your working life into 5 year chunks. That's how many tries you get, roughly speaking, if you're going the startup route.