I agree with the quote on the first paragraph: &quot;it doesn’t make sense to leave your job before having a good indication that you’re working on a real business opportunity.&quot;<p>... but the title omits the &quot;before having a good indication&quot; part !!<p>I&#x27;m actually in that quandary right now (when to quit my day job and focus 100% on my startup). Right now is definitely not the time, since we don&#x27;t have the &quot;good indication&quot; part, or even a finished MVP.<p>But once we do have a half-decent MVP, we&#x27;ll need to focus on customer validation, which means in our case getting to actual sales meetings, and that takes a lot of time.<p>Also, if you&#x27;re building a product (especially if it&#x27;s innovative and can&#x27;t easily show it before having an MVP), having a &quot;login screen&quot; alone won&#x27;t cut it.