Working Saturdays and maybe Sundays works once or twice a year.

Then you get to the next week completely unmotivated having had no rest and feeling like crap

Tuning out of work is needed

Just a note, not all people are wired the same - some people are very good at working long hours and 7 days a week. I've done it at times, and my brother has done it to an extreme before.

True, though "being able to" doesn't mean you should.

Also there's a frequent confusion between "working longer hours" and working more (might not be the case here)

The work environment at NeXT was amazing because of the colleagues. That particular weekend was demoralizing and disillusioned me about Steve Jobs, not because of the criticism, but because it was so out of touch with what the market, application developers, would like.

That said, Steve's intuition was right. We pushed on the impossible for a while and found a way to make the actual technology work the way he liked, by using an entity-relationship model to object-pointer mapping. And that approach later became the standard paradigm for database application building tools across the industry.

Steve made unreasonable demands, but he was on the right side of history sufficiently often that top people wanted to be on his team and tolerated the craziness of it.