Some are missing the point, most of the work we as software developers does not need long hours but deep focus. The best of the best are able to have 4 hours worth of deep focus, and we are lucky to get an hour or two of it. That would be huge. So the good habits that help us with focus and emphasizes on recovery like walking in the woods (our natural habitat), meditation etc. Its not the time, the hardware of brain is pretty much fixed, its the software, habits and mindset that make the difference.