I built a company as a "part-time founder". I think it's quite do-able and really forces you to focus your time. Parkinson's Law states that tasks tend to exp

I built a company as a "part-time founder". I think it's quite do-able and really forces you to focus your time. Parkinson's Law states that tasks tend to expend to fill to time allotted for them... That's true with Founders as well. That said, I think your day job needs to be fairly light for this to work. At the time, I was doing light consulting after having sold my first company. I'm currently working on another little startup idea (http://www.rescuetime.com) http://www.rescuetime.com) but it's been moving a LOT slower, as my day job is something I invest a lot more time and energy into. Of course, it very much depends on the scope of the problem you are trying to solve. You're never going to build the next salesforce.com as a PT founder. ;-)