[domiono]

There are times in a startup, where you simply have to do the work without thinking too much. This is for instance when you have finished all your wireframes and then you simply have to code it down for two months. This is simply grunt work, where you don't need to think much, you only need to get it done.

Then there are phases in a startup, where you need insane creativity. These phases are for instance after you've found product/market fit, say you got to 10,000 users with your product, however, now you need to figure out how to get to 100,000.

In these times it's not worth at all pushing 18h days, it's much better being a balanced human being who goes out with friends, does their exercise and eats well, because all you need at that point is ideas and creativity.