In section 2.3 of the GTD book (The Six-Level Model for Reviewing Your Own Work) David Allen wrote that you would have probably three to five hundred hours’ worth of current actions to do if you stopped the world right now and got no more input from yourself or anyone else. He also wrote that many of the actions that you currently have in front of you are created by the thirty to one hundred projects on your plate.
If I divide 300 to 500 working hours by 30 to 100 projects, I get the result of 3 to 17 working hours per project.
Did I get this right? Does the GTD methodology assume or imply that the size of a usual project is not more than about 20 working hours?