Ask HN: At what point you should decide to quit your job.

Our team is working on an idea and is in the process of releasing the first prototype somewhere around the end of this month. However, we currently also have a fulltime job and so need to manage the time. we were thinking at what stage one should start working fulltime in their startups and hence would like to get the opinion of fellow HN users ( many of you would have done the same at some point) Some of the milestones that we could think of were 1. A major release. 2. Get some seed funding ( so we dont have to bootstrap) 3. After gaining traction among users. 4. Getting into some accelerator program. . . Feel free to add your experiences and thoughts on the same.