I have a moderately successful hardware side project (eink calendars) and I am constantly torn and questioning myself. Am I spending * too much time on it, gi

I have a moderately successful hardware side project (eink calendars) and I am constantly torn and questioning myself. Am I spending * too much time on it, given how little money it makes? * or too little time on it, given that it’s already making money and maybe if I worked on it more, I could grow it enough so I can quit my day job ?