Is there such a thing as part time entrepreneur?

This is a tricky question. I've often thought that working full time on a project is the only way to actually get a project to move and become a business. But, I've started to see evidence of people allayin gthe risk of quitting and working on projects part-time as a way of mitigating risk. This gives a project the time it needs to gestate and move forward so that an entrepreneur can quit their job with greater confidence. How can I argue with that staretgy? Still -- I think the quitting the job thing is a major milestone for a business and is revealing of the kind of commitment required to make a business really go.