The premise of this chapter is that by cultivating a high-quality leisure life first, it will become easier to minimize low-quality digital diversion… - Cal Newport

Deep work is at a severe disadvantage in a technopoly because it builds on values like quality, craftsmanship, and mastery that are decidedly old-fashioned and nontechnological. Even worse, to support deep work often requires the rejection of much of what is new and high-tech.

Then there’s the issue of cognitive capacity. Deep work is exhausting because it pushes you toward the limit of your abilities. Performance psychologists have extensively studied how much such efforts can be sustained by an individual in a given day.* In their seminal paper on deliberate practice, Anders Ericsson and his collaborators survey these studies. They note that for someone new to such practice (citing, in particular, a child in the early stages of developing an expert-level skill), an hour a day is a reasonable limit. For those familiar with the rigors of such activities, the limit expands to something like four hours, but rarely more.

This magician’s trick of shifting the units of measure from money to time is the core novelty of what the philosopher Frédéric Gros calls Thoreau’s “new economics,” a theory that builds on the following axiom, which Thoreau establishes early in Walden: “The cost of a thing is the amount of what I will call life which is required to be exchanged for it, immediately or in the long run.