I second the disclaimer. The hourly path for money is fine, or also consider a hard focused normal work week followed by the same level of focus on complementary tasks on the weekend or evenings, such as a side project, open source contributions, or further studies. The same habits around environment, body, and mind carry over to benefit both projects and only the exact artifacts of the effort need change. As Csikszentmihalyi points out in Flow, many of make ourselves miserable by having no focus whatsoever in our leisure time.