I haven't got any readings for you, sorry, but I can say that valuing one's time is fundamental to much of mainstream economics. Specifically, in many models an agents time is split up into working vs. non-working (leisure), and you assume an agent desires both leisure time and money to purchase things with. This very basic idea can be used to construct all sorts of interesting, explanative and predictive models. So it would make sense that you would want to get the most out of your time, seeing as that's one of the building blocks of your enjoyment of life