I and 2 cofounders are near to launching our iphone app and we have our daily job.
I'm the backend and frontend developer(rest-full api needed for our iphone app), the other two are the creative guys,
and I've to admit that it has been hard to think, design, and do a product in a spare time(especially if you have a wife and a child).
And there are other aspects of the launching such as the site, the company to found and many things that require a lot of time.
I hope the app and the business I want to build around succeded so I will quit my current profitable job.