Purpose is the most overworked word on the self-help shelf, which makes a title that uses it plainly rather than dressing it up faintly refreshing. Kalorik D. Monroe is not promising a system or a secret. The proposal is right there in the verb: build.
Three hours suits that framing. It is long enough to make a case and work it through, short enough that nobody could mistake it for a course of study. Work at this length tends to come from people who want to be useful more than they want to be admired, and it is best judged on whether anything actually changes afterwards.
Nothing further is recorded in our catalogue, so the writing will have to introduce itself.