I can tell you that I worked 80 hours a week for several months and while it is not effective, it was "necessary" for the business to survive. I had 4-6 hours p

I can tell you that I worked 80 hours a week for several months and while it is not effective, it was "necessary" for the business to survive. I had 4-6 hours per day that were really effective (if even), the others were just there to get simple stuff done, which was necessary to meet deadlines. Would I do it again? Absolutely not, because it is simply bad management. But I can imagine how easy it is to get stuck in such a work environment. Or people might think "when it is working once, it will work all the time". The truth is that if the deadlines and work would have been planned better it would easily be achievable in 40 hours. The problem is that some startups are super chaotic, overpromise, underdeliver without even thinking about how long something takes.