I would say that if we feel some lack of passion in the regular job the it's already the time to start wondering: "is this really where I want to be?". However

I would say that if we feel some lack of passion in the regular job the it's already the time to start wondering: "is this really where I want to be?". However, starting something of our own needs a very careful planning. It also debends on an individual's situation. I wnt through that journey myself. I was loving my job, but then came a time when I felt that it reached that stage when many of two days were proving to be same. I was into IT, but had moved to the business side. Starting a tech venture just based on my skillsets was not possible. I decided to start something into IT recruitment. It was something completely new to me. A completely different path. It was not really ethical to devote time in preparing myslelf for the new journey, when I was in aregular (and damn good) job. But then sometimes one needs to weigh - it's my tomorrow's survival and success or being a Godly monk - only 100% loyalty to the employers. Well, I decided that after close to a decade of giving my 120% or more to the company for 10 years, it would not be unethical if I give 75% for 6 months or so. I am not ashamed to say that, that's what I did. 25% time for 6 months used in preparing and learning about my new hourney - and then I started my nown company 3 years back - and since then we only greww, with no looking back.