Earlier quoted context omitted.
I love these stories also but I am genuinely curious how you were able to work 8 hours a day on it and also work your regular job. I assume you don't work a full time job, otherwise it seems unhealthy. I put a lot of time into my side projects but that is mostly the whole saturday and sunday, but even then I obviously don't feel so well rested on monday.
There's 24 hours in a day. Read Bezos or Musk's or anybody stories and they'll tell you they worked 20-23 hours a day. It's fucking crazy with some people, but that's what it takes to get ahead of the competition. Edit: Please note that I'm not advocating that anybody should do this, but just be aware that a lot of people are setting that level for themselves and in some cases for their subordinates.
That said, Bill Gates definitely said he and some of his crew were working 16 hour days delivering their first DOS release.
Point is, you might work some intense stretches, and doing that shows your passion and might land give you an edge when you need it. But you don't need to go insane. If you work 8 hours day job, don't spend hours in commute, you can be perfectly healthy spending 2 hours of your night time each day working a side gig.