One of the concepts in the name that tune, errr learn to Code in fewer days than the other brands of books is that each chapter is a Lesson that should be worked on for a while before proceeding to the next lesson.

So while it is 24 hours or 7 days or whatever, they are not meant to be a sequential 24 hours, but 24 hours spread over a period of time.

I could never interest a publisher in creating a series called "Learn in 23 Hours", I'm sure it would have a clear advantage over its slower 24 hour competition. Perhaps 23.99 hours?