Ask HN: anyone doing a start-up, but have a non-technical full-time job?

Does anybody here works on a technology start-up project and got a full-time job which isn't related to technology such as truck driver, nurse aide, carpenter etc. you know what I mean? Like for me, I work full time as a nurse at night and work on my start-up project at daytime or during my days-off. What is the rate of success for this kind of situation in a start-up? And how would you do this if you're in this situation? Are you gonna quit or just keep doing it?