I don't see why. Part of the article is that you get down to what you need to do as soon as possible during the working hours. So you have your 1-6 (or whatever

I don't see why. Part of the article is that you get down to what you need to do as soon as possible during the working hours. So you have your 1-6 (or whatever stretch of time you choose), you get down to it as soon as you can. No YouTube, no HN, nothing. Deep focus like that can really only be sustained for so long. I'd imagine that around dinnertime, I'd be ready to wrap up.